Journal articles: 'Existence variety'

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Zhang, Wen Ting. "Existence of a new limit variety of aperiodic monoids." Semigroup Forum 86, no. 1 (May 30, 2012): 212–20. http://dx.doi.org/10.1007/s00233-012-9410-6.

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Lee, Min Ho. "Existence of Torus bundles associated to cocycles." Bulletin of the Australian Mathematical Society 73, no. 3 (June 2006): 345–51. http://dx.doi.org/10.1017/s0004972700035383.

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A Kuga fibre variety is a fibre bundle over a locally symmetric space whose fibre is a polarized Abelian variety. We describe a complex torus bundle associated to a 2-cocycle of a discrete group, which may be regarded as a generalized Kuga fibre variety, and prove the existence of such a bundle.

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Auinger, K., J. Doyle, and P. R. Jones. "On existence varieties of locally inverse semigroups." Mathematical Proceedings of the Cambridge Philosophical Society 115, no. 2 (March 1994): 197–217. http://dx.doi.org/10.1017/s0305004100072042.

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AbstractA locally inverse semigroup is a regular semigroup S with the property that eSe is inverse for each idempotent e of S. Motivated by natural examples such as inverse semigroups and completely simple semigroups, these semigroups have been the subject of deep structure-theoretic investigations. The class ℒ ℐ of locally inverse semigroups forms an existence variety (or e-variety): a class of regular semigroups closed under direct products, homomorphic images and regular subsemigroups. We consider the lattice ℒ(ℒℐ) of e-varieties of such semigroups. In particular we investigate the operations of taking meet and join with the e-variety CS of completely simple semigroups. An important consequence of our results is a determination of the join of CS with the e-variety of inverse semigroups – it comprises the E-solid locally inverse semigroups. It is shown, however, that not every e-variety of E-solid locally inverse semigroups is the join of completely simple and inverse e-varieties.

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Hall, T. E. "Identities for existence varieties of regular semigroups." Bulletin of the Australian Mathematical Society 40, no. 1 (August 1989): 59–77. http://dx.doi.org/10.1017/s000497270000349x.

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A natural concept of variety for regular semigroups is introduced: an existence variety (or e-variety) of regular semigroups is a class of regular semigroups closed under the operations H, Se, P of taking all homomorphic images, regular subsernigroups and direct products respectively. Examples include the class of orthodox semigroups, the class of (regular) locally inverse semigroups and the class of regular E-solid semigroups. The lattice of e-varieties of regular semigroups includes the lattices of varieties of inverse semigroups and of completely regular semigroups. A Birkhoff-type theorem is proved, showing that each e-variety is determined by a set of identities: such identities are then given for many e-varieties. The concept is meaningful in universal algebra, and as for regular semigroups could give interesting results for e-varieties of regular rings.

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Tsimerman, Jacob. "The existence of an abelian variety over Q isogenous to no Jacobian." Annals of Mathematics 176, no. 1 (July 1, 2012): 637–50. http://dx.doi.org/10.4007/annals.2012.176.1.12.

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Doyle, J. "On existence varieties of orthodox semigroups." Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics 58, no. 1 (February 1995): 100–125. http://dx.doi.org/10.1017/s1446788700038131.

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AbstractAn existence variety of regular semigroups is a class of regular semigroups which is closed under the operations of forming all homomorphic images, all regular subsemigroups and all direct products. In this paper we generalize results on varieties of inverse semigroups to existence varieties of orthodox semigroups.

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YEH, Y. T. "THE EXISTENCE OF E-FREE OBJECTS IN E-VARIETIES OF REGULAR SEMIGROUPS." International Journal of Algebra and Computation 02, no. 04 (December 1992): 471–84. http://dx.doi.org/10.1142/s0218196792000281.

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An existence variety (or e-variety) of regular semigroups is a class of regular semigroups which is closed under [Formula: see text], and ℍ. This concept was introduced by T.E. Hall and independently for orthodox semigroups by J. Kadourek and M.B. Szendrei who called them bivarieties. In this paper we prove the existence of e-free objects in each e-variety of E-solid regular semigroups and in each e-variety of locally inverse regular semigroups. By contrast, we show that there is no e-free object in other e-varieties.

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8

OSTWALD, RENATA N. "On the existence of Levi Foliations." Anais da Academia Brasileira de Ciências 73, no. 1 (March 2001): 07–13. http://dx.doi.org/10.1590/s0001-37652001000100002.

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Let L <img src="http:/img/fbpe/aabc/v73n1/0059c.gif"> <img src="http:/img/fbpe/aabc/v73n1/0059c2.gif"> be a real 3 dimensional analytic variety. For each regular point p <img src="http:/img/fbpe/aabc/v73n1/0059e.gif"> L there exists a unique complex line l p on the space tangent to L at p. When the field of complex line p <img ALIGN="MIDDLE" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img4.gif" ALT="$\displaystyle \mapsto$"> l p is completely integrable, we say that L is Levi variety. More generally; let L <img src="http:/img/fbpe/aabc/v73n1/0059c.gif"> M be a real subvariety in an holomorphic complex variety M. If there exists a real 2 dimensional integrable distribution on L which is invariant by the holomorphic structure J induced by M, we say that L is a Levi variety. We shall prove: Theorem. Let <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img5.gif" ALT="$ \cal {L}$"> be a Levi foliation and let <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img6.gif" ALT="$ \cal {F}$"> be the induced holomorphic foliation. Then, <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img6.gif" ALT="$ \cal {F}$"> admits a Liouvillian first integral. In other words, if <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img5.gif" ALT="$ \cal {L}$"> is a 3 dimensional analytic foliation such that the induced complex distribution defines an holomorphic foliation <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img6.gif" ALT="$ \cal {F}$">; that is, if <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img5.gif" ALT="$ \cal {L}$"> is a Levi foliation; then <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img6.gif" ALT="$ \cal {F}$"> admits a Liouvillian first integral--a function which can be constructed by the composition of rational functions, exponentiation, integration, and algebraic functions (Singer 1992). For example, if f is an holomorphic function and if theta is real a 1-form on <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img8.gif" ALT="$ \mathbb {R}$">; then the pull-back of theta by f defines a Levi foliation <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img5.gif" ALT="$ \cal {L}$"> : f*theta = 0 which is tangent to the holomorphic foliation <img ALIGN="BOTTOM" BORDER="0" src="http:/img/fbpe/aabc/v73n1/0059img6.gif" ALT="$ \cal {F}$"> : df = 0. This problem was proposed by D. Cerveau in a meeting (see Fernandez 1997).

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Buryak, A. Y. "Existence of a singular projective variety with an arbitrary set of characteristic numbers." Mathematical Research Letters 17, no. 3 (2010): 395–400. http://dx.doi.org/10.4310/mrl.2010.v17.n3.a2.

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Ott, Dennis, and Raymond Therrien. "Swiping in a variety of Ontario French." Canadian Journal of Linguistics/Revue canadienne de linguistique 65, no. 1 (October 1, 2019): 52–74. http://dx.doi.org/10.1017/cnj.2019.25.

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AbstractThis paper documents the existence of swiping – that is, inversion of a wh-phrase and its associated preposition under sluicing – in a non-Germanic language. We discuss swiping in a variety of Ontario French (Lafontaine French, LFF), which shares some of the characteristics of its extensively-studied English counterpart (Ross 1969, Merchant 2002, among others). We offer a preliminary description of swiping in LFF and consider some implications of these novel facts for the theory of swiping and sluicing. We suggest that LFF swiping supports an analysis in terms of non-constituent deletion, as originally suggested by Ross (1969) in his seminal work on sluicing.

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McSweeney, Brendan. "Dynamic Diversity: Variety and Variation Within Countries." Organization Studies 30, no. 9 (September 2009): 933–57. http://dx.doi.org/10.1177/0170840609338983.

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National models of social action over-privilege continuity and uniformity. They discount change — which they lack the capacity to explain (other than through exogenous shocks) — and neglect diversity within countries. This paper focuses on the national culture model which it argues requires commitment to illogical arguments and to suppositions which are theoretically and empirically untenable. An evaluation of each, it is argued, points to the existence of, and possibilities for, considerable national diversity and change — not pervasive and enduring national uniformity. Reflecting on the model’s rise and fall in anthropology, the paper also provides an outline explanation of its retention within organization studies and speculates about its future within that discipline.

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Ludwiczyński, Antoni, and Czesław Szmidt. "Variety of Psychological Contracts and Their Conditions." Kwartalnik Ekonomistów i Menedżerów 45, no. 3 (July 19, 2017): 119–39. http://dx.doi.org/10.5604/01.3001.0010.6279.

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The problems of psychological contracts have been investigated by world scientific circles for years now. In Poland this concept is relatively unknown. The goal of this study is to present selected elements from the theories discussing the genesis, the essence, main types and dynamics of such contracts. It also presents the results of empirical tests concerning an influence of four selected features characterizing researched employees (sex, age, position and form of employment) upon the contents of their psychological contracts. The study proves the existence of considerable differences observed in the measured dimensions. This fact should call upon the employers for taking actively into consideration this particular variety when managing the people in organisations.

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Pang, Terence T. T. "Hong Kong English: A stillborn variety?" English Today 19, no. 2 (April 2003): 12–18. http://dx.doi.org/10.1017/s0266078403002037.

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For a distinctive variety of English to subsist and be acknowledged in Hong Kong, localization is not enough. Indigenization through general acceptance is also necessary, but will not easily be forthcoming, regardless of the claims and assertions of linguists in Hong Kong or elsewhere regarding the existence of a distinctive ‘Hong Kong English’. In addition, Hong Kong teachers of English will not accept or adopt distinctive local usages in their classrooms, regardless of the everyday use of such usages. The sociolinguistic situation is increasingly triglossic, in terms of the three languages Cantonese, Putonghua, and English, each of which has distinct functions in terms of Hong Kong, mainland China, and the world at large. A dominant ideology of linguistic purism impels people to seek outside standards with regard to both English and Putonghua, and to deny that there is a viable local variety of English, despite the length of time that the language has been used in Hong Kong.

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Fukasawa, Satoru, and Hajime Kaji. "Existence of a non-reflexive embedding with birational Gauss map for a projective variety." Mathematische Nachrichten 281, no. 10 (September 5, 2008): 1412–17. http://dx.doi.org/10.1002/mana.200610688.

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15

Rychkov, K. L. "Sufficient conditions for the existence of a graph with a given variety of balls." Journal of Applied and Industrial Mathematics 1, no. 3 (September 2007): 380–85. http://dx.doi.org/10.1134/s1990478907030131.

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16

Hopkins, John. "Government of foreign state–proof of existence." Cambridge Law Journal 57, no. 3 (November 1998): 429–71. http://dx.doi.org/10.1017/s0008197398243017.

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THE State speaks with one voice in international law. And that voice, of course, is the executive's, usually, but not invariably, that of the Foreign and Commonwealth Office (FCO). Upon a variety of matters a certificate as to certain facts issued by the executive will be regarded by the courts as conclusive of them. This function was, historically, a matter of common law though there are now several statutory provisions in that regard, most notably the Diplomatic Privileges Act 1964 s. 4 and the State Immunity Act 1978 s. 21 identifying defendants who will have immunity from the jurisdiction (see [1998] C.L.J. 4).

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Podhorodecka, Katarzyna. "Variety of Economic Share of Tourism on Tropical Islands." Miscellanea Geographica 14, no. 1 (December 1, 2010): 303–14. http://dx.doi.org/10.2478/mgrsd-2010-0029.

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Abstract The author seeks an answer to the question whether a higher intensity of tourism movement is connected with a higher share of tourism in the economy in selected tropical island territories. With the use of the Spearman correlation coefficient, the existence of the average positive correlation between the intensity of tourism movement and the share of tourism in the economy has been determined. In the second part of paper, the author looks at the conditions which affect the role of tourism in the economy in proportion to the intensity of tourism movement. For this purpose, the Chi-square test and detailed case studies of chosen tropical islands are discussed.

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Duggal, K. L. "A Review on Unique Existence Theorems in Lightlike Geometry." Geometry 2014 (July 7, 2014): 1–17. http://dx.doi.org/10.1155/2014/835394.

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This is a review paper of up-to-date research done on the existence of unique null curves, screen distributions, Levi-Civita connection, symmetric Ricci tensor, and scalar curvature for a large variety of lightlike submanifolds of semi-Riemannian (in particular, Lorentzian) manifolds, supported by examples and an extensive bibliography. We also propose some open problems.

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Lazović, Biljana, Mirjana Adakalić, Stoja Ljutica, Tatjana Perović, and Miroslav Čizmović. "Variability of Oil Content in Fruit of Olive Variety Žutica on Montenegrin Coast." АГРОЗНАЊЕ 15, no. 1 (June 15, 2015): 55. http://dx.doi.org/10.7251/agren1401055l.

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Žutica, the major variety on Montenegrin Coast, belongs to the group of olive varieties for oil production, with oil content in average above 21%. During the research of the properties of Žutica variety, the existence of variability in the oil content was recorded. In order to determine the degree of the variability of oil content within this variety, the fruits of 42 accessions were analyzed. The results confirmed high content of oil as well as the existence of variability of this parameter between the studied accessions. Twenty two accessions had the content of oil of over 20%, while 13 accessions had the oil content greater than 22% in fresh matter. The highest oil content was in fruit of VAL2 (24.3%) and in dry matter in DUB (63.77%). The results suggest Žutica accessions (clones) with higher oil content promising for spread in the new plantations.

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Auinger, Karl. "On the Lattice of Existence Varieties of Locally Inverse Semigroups." Canadian Mathematical Bulletin 37, no. 1 (March 1, 1994): 13–20. http://dx.doi.org/10.4153/cmb-1994-003-1.

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AbstractThe mapping which assigns to each existence variety of locally inverse semigroups the class of all pseudosemilattices of idempotents of members of is shown to be a complete, surjective homomorphism from the lattice of existence varieties of locally inverse semigroups onto the lattice of varieties of pseudosemilattices.

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Santoro, Bianca. "Existence of complete Kähler Ricci-flat metrics on crepant resolutions." Communications in Contemporary Mathematics 16, no. 03 (May 26, 2014): 1450003. http://dx.doi.org/10.1142/s0219199714500035.

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In this note, we obtain existence results for complete Ricci-flat Kähler metrics on crepant resolutions of singularities of Calabi–Yau varieties. Furthermore, for certain asymptotically flat Calabi–Yau varieties, we show that the Ricci-flat metric on the resolved manifold has the same asymptotic behavior as the initial variety.

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Tian, Canrong. "Existence of Solutions for a Quasilinear Reaction Diffusion System." Abstract and Applied Analysis 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/368425.

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The degenerate reaction diffusion system has been applied to a variety of physical and engineering problems. This paper is extended the existence of solutions from the quasimonotone reaction functions (e.g., inhibitor-inhibitor mechanism) to the mixed quasimonotone reaction functions (e.g., activator-inhibitor mechanism). By Schauder fixed point theorem, it is shown that the system admits at least one positive solution if there exist a coupled of upper and lower solutions. This result is applied to a Lotka-Volterra predator-prey model.

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Hazen, Allen. "On the Reality of Existence and Identity." Canadian Journal of Philosophy 15, no. 1 (March 1985): 25–35. http://dx.doi.org/10.1080/00455091.1985.10716407.

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Ian Hacking's [6] is a spirited romp though a broad field of metaphysics, touching on a variety of important questions, and appealing to deep results in mathematical logic while remaining free of logical pedantry. Philosophical journals might be more fun to read if others could write in his style. It is an essay in applying the theory of logic expounded in more detail in his very interesting [7]. (Goran Sundholm, in [15], has raised grave difficulties for Hacking's notion of a ‘do-it-yourself’ semantics, but the overall project remains attractive. In particular, I find Hacking's contention that he has captured the notion of logic that Whitehead and Russell were working with both convincing and intriguing.) Unfortunately, despite my sympathy for his project, I have a number of criticisms to make of his argument. Some of them are picky logical points, but the major conclusions of [6] are affected.

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SHI, HAIPING, and YUANBIAO ZHANG. "Existence results of solitons in discrete non-linear Schrödinger equations." European Journal of Applied Mathematics 27, no. 5 (February 15, 2016): 726–37. http://dx.doi.org/10.1017/s0956792516000036.

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The discrete non-linear Schrödinger equation is one of the most important inherently discrete models, having a crucial role in the modelling of a great variety of phenomena, ranging from solid-state and condensed-matter physics to biology. In this paper, a class of discrete non-linear Schrödinger equations are considered. Using critical point theory in combination with periodic approximations, we establish some new sufficient conditions on the existence results for solitons of the equation. The classical Ambrosetti–Rabinowitz superlinear condition is improved.

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Schilling-Estes, Natalie, and Walt Wolfram. "Convergent explanation and alternative regularization patterns:Were/weren'tleveling in a vernacular English variety." Language Variation and Change 6, no. 3 (October 1994): 273–302. http://dx.doi.org/10.1017/s0954394500001691.

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ABSTRACTAlthough the process of analogical leveling seems relatively straightforward and its directionality readily predictable, the existence of cross-dialectal leveling alternatives suggests that the processes that actuate and embed analogical leveling can actually be quite complex. Using the case of a vernacular variety spoken on the Outer Banks of North Carolina, we demonstrate how linguistic-systemic principles such as remorphologization, psycholinguistic principles of perceptual saliency, and sociolinguistic processes of symbolic identity converge to account for the development and maintenance of leveling toweren't(I/you/(s)he/we/ you/they weren't here) in this post-insular island community.

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Gurjar, Sudarshan, and Arjun Paul. "Criterion for existence of a logarithmic connection on a principal bundle over a smooth complex projective variety." Annals of Global Analysis and Geometry 58, no. 3 (June 30, 2020): 241–51. http://dx.doi.org/10.1007/s10455-020-09723-8.

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Maróti, Miklós. "The existence of a near-unanimity term in a finite algebra is decidable." Journal of Symbolic Logic 74, no. 3 (September 2009): 1001–14. http://dx.doi.org/10.2178/jsl/1245158096.

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AbstractWe prove that it is decidable of a finite algebra whether it has a near-unanimity term operation, which settles a ten-year-old problem. As a consequence, it is decidable of a finite algebra in a congruence distributive variety whether it admits a natural duality.

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Intykbayev, Y. "VARIETY ART OR CULTURE OF THE MAJORITY OF MODERN KAZAKHSTAN." EurasianUnionScientists 4, no. 3(84) (April 15, 2021): 8–12. http://dx.doi.org/10.31618/esu.2413-9335.2021.4.84.1290.

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The article analyzes the position of the pop art in Kazakhstan, provides a brief excursion into the history of the formation of pop art, raises the problems associated with the positioning of the pop art or modern mass musical culture in connection with the tendency to rough and somewhat non-aesthetic commercialization. The questions of the existence of pop music and its role in the formation of a passive, uncritical perception of such a culture among the broad masses are raised, which leads to the possibility of manipulating the masses. The chronological-descriptive method in outlining the main milestones of the formation of the stage refers to the question of the perspective of the question of the general position of the stage in Kazakhstani society. One of the aspects of the article is connected with the methods of interaction of the media with various genres of musical mass culture, as well as the work of most producers who do not possess the skills of aesthetic perception of music.

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Garcia-Armas, Mario. "Strongly Incompressible Curves." Canadian Journal of Mathematics 68, no. 3 (June 1, 2016): 541–70. http://dx.doi.org/10.4153/cjm-2015-012-3.

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AbstractLet G be a finite group. A faithful G-variety X is called strongly incompressible if every dominant G-equivariant rationalmap of X onto another faithful G-variety Y is birational. We settle the problem of existence of strongly incompressible G-curves for any finite group G and any base field k of characteristic zero.

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PERL, MARTIN L. "CAN THE EXISTENCE OF DARK ENERGY BE DIRECTLY DETECTED?" International Journal of Modern Physics A 24, no. 18n19 (July 30, 2009): 3426–36. http://dx.doi.org/10.1142/s0217751x09047028.

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Over the last decade, astronomical observations show that the acceleration of the expansion of the universe is greater than expected from our understanding of conventional general relativity, the mass density of the visible universe, the size of the visible universe and other astronomical measurements. The additional expansion has been attributed to a variety of phenomenon that have been given the general name of dark energy. Dark energy in the universe seems to comprise a majority of the energy in the visible universe amounting to about three times the total mass energy. But locally the dark energy density is very small. However it is not zero. In this paper I describe the work of others and myself on the question of whether dark energy density can be directly detected. This is a work-in-progress and I have no answer at present.

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Bailey, Andrew M., and Andrew Brenner. "Why Composition Matters." Canadian Journal of Philosophy 50, no. 8 (November 2020): 934–49. http://dx.doi.org/10.1017/can.2020.52.

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AbstractMany say that ontological disputes are defective because they are unimportant or without substance. In this paper, we defend ontological disputes from the charge, with a special focus on disputes over the existence of composite objects. Disputes over the existence of composite objects, we argue, have a number of substantive implications across a variety of topics in metaphysics, science, philosophical theology, philosophy of mind, and ethics. Since the disputes over the existence of composite objects have these substantive implications, they are themselves substantive.

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Komunjer, Ivana, and Giuseppe Ragusa. "EXISTENCE AND CHARACTERIZATION OF CONDITIONAL DENSITY PROJECTIONS." Econometric Theory 32, no. 4 (May 13, 2015): 947–87. http://dx.doi.org/10.1017/s0266466615000158.

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In this paper we propose primitive conditions under which a projection of a conditional density onto a set defined by conditional moment restrictions exists and is unique. Moreover, we provide an analytic expression of the obtained projection. The range of applications where conditional density projections are used is wide. The derived results are potentially useful in a variety of areas including: semiparametric efficient estimation and optimal testing in (conditional) moment models, Bayesian prior determination and inference in semiparametric models, density forecasting, and simulation-based econometric analysis.Regarding existence, we propose three different combinations of assumptions that are all sufficient to show that the projection exists and is unique. The proposed conditions exhibit a clear trade off between restrictions put on the divergence between the conditional densities and on the moment function which defines the projection set. Depending on the nature of the application, the researcher can pick and choose which set of conditions to use. Our second set of results characterizes the projection. The expression for the projected density is new though not surprising given the previously obtained results for the unconditional case. The projection is characterized by the dual of the original projection problem. In establishing the strong duality, however, we work with a constraint qualification condition that is weaker than that used by Borwein and Lewis (1991a, 1992a, 1993 in their seminal work concerning the unconditional case.

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Dervan, Ruadhaí. "K-SEMISTABILITY OF OPTIMAL DEGENERATIONS." Quarterly Journal of Mathematics 71, no. 3 (July 15, 2020): 989–95. http://dx.doi.org/10.1093/qmathj/haaa012.

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Abstract K-polystability of a polarized variety is an algebro-geometric notion conjecturally equivalent to the existence of a constant scalar curvature Kähler metric. When a variety is K-unstable, it is expected to admit a ‘most destabilizing’ degeneration. In this note we show that if such a degeneration exists, then the limiting scheme is itself relatively K-semistable.

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ITO, TOSHIKAZU, and BRUNO SCARDUA. "A NON-EXISTENCE THEOREM FOR MORSE TYPE HOLOMORPHIC FOLIATIONS OF CODIMENSION ONE TRANSVERSE TO SPHERES." International Journal of Mathematics 21, no. 04 (April 2010): 435–52. http://dx.doi.org/10.1142/s0129167x1000615x.

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We prove that a Morse type codimension one holomorphic foliation is not transverse to a sphere in the complex affine space. Also we characterize the variety of contacts of a linear foliation with concentric spheres.

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O'Regan, Donal. "A note on multivalued differential equations on proximate retracts." Journal of Applied Mathematics and Stochastic Analysis 12, no. 2 (January 1, 1999): 169–78. http://dx.doi.org/10.1155/s1048953399000179.

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This paper discusses viable solutions for differential inclusions in Banach spaces. Existence will be established in two steps. In step 1, a nonlinear alternative of Leray-Schauder type [8] for maps with closed graphs will be used to establish a variety of existence principles for the Cauchy differential inclusion. Step 2 involves using the results in step 1 together with some tricks involving the Bouligand cone (and sometimes the Urysohn function) so that new existence criteria can be established for multivalued differential equations on proximate retracts.

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Moya Giusti, Matías Victor. "On the existence of ghost classes in the cohomology of the Shimura variety associated to $GU(2, 2)$." Mathematical Research Letters 25, no. 4 (2018): 1227–49. http://dx.doi.org/10.4310/mrl.2018.v25.n4.a9.

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O'Regan, Donal. "Fixed point theory of Mönch type for weakly sequentially upper semicontinuous maps." Bulletin of the Australian Mathematical Society 61, no. 3 (June 2000): 439–49. http://dx.doi.org/10.1017/s0004972700022450.

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A variety of fixed point results are presented for weakly sequentially upper semicontinuous maps. In addition an existence result is established for differential equations in Banach spaces relative to the weak topology.

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Remizova, Olena. "ARCHITECTURAL MEMORY AND FORMS OF ITS EXISTENCE." JOURNAL OF ARCHITECTURE AND URBANISM 44, no. 2 (September 14, 2020): 97–108. http://dx.doi.org/10.3846/jau.2020.13053.

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The article attempts to highlight the traces of memory in the theory, history and practice of architecture. The subject of research is the existing forms of memory in architecture. It is traditionally accepted that the “history of architecture” as a science is the main repository of knowledge about the evolution of architecture. Facts and artifacts, descriptions of monuments and cities are retained in it. The article emphasizes that the traditional “history of architectural objects” is not the only form of memory. Another equally important and complicated aspect of the architectural memory is detected during the decoding of the evolution of project activity and its language. Analysis of the evolution of architecture allowed us to differentiate the epochs in which historical thinking prevails: the Renaissance, Romanticism, Eclecticism, Art Deco, Postmodernism. They are characterized by such ways of thinking as dialogical, historical and typological, historical and associative. They are opposed to design approaches in which abstract thinking dominates (Art Nouveau and Modernism). The article shows that the concept of architectural memory has many shades and manifests itself in a variety of different forms of professional consciousness. As historical knowledge, memory exists in such forms as: a chronological description, science of history, evolutionary studies, catalog of styles, museum, archive. In designing and its language, memory is represented in such forms as canon, dialogue with bygone era, norm, architectural fantasy, remembrance, historical association, reconstruction, restoration and others. It is shown that the most important way of storing and transferring information is the architectural language and compositional logic. Postmodern consciousness raised the problem of loss of memory and the development of architectural language and communication of culture.

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Heller, Alex. "An existence theorem for recursion categories." Journal of Symbolic Logic 55, no. 3 (September 1990): 1252–68. http://dx.doi.org/10.2307/2274486.

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Recursion theory has been dominated by one example. The notion of a dominical category was introduced (see [2] and [3]) at least in part in the hope of subverting this dominance. The structures of number theory, freed from this original context, led to much of modern algebra with a consequent enrichment of number theory itself: it seemed not unreasonable to attempt to contribute, however modestly, to a similar development of recursion theory. Thus (in the loosest sort of analogy) recursion categories are intended to stand in relation to the class of partial recursive functions as rings do to the rational integers.But if such a generalization is to serve its intended purpose, it ought to allow examples substantially different in spirit from the prototype. Recursion categories are, of course, the proper generalization of classical recursion theory. As a novice in this formidable field I am incapable of encompassing its full extent and must rely on the advice of others (I thank in particular R. DiPaola) in concluding that most of these earlier generalizations are not of this character. Indeed, the examples of recursion categories so far adduced (cf., in addition to the references above, [1] and [4]) are themselves closely tied to the classical one.We attempt here to open the door to radically disparate examples by proving an existence theorem allowing the construction of recursion categories in a wide, and so far unexplored, variety of contexts very distant from that of the natural or ordinal numbers and their subsets, the locus of the traditional theory.In order to do this, it has been necessary to introduce a number of unfamiliar notions—unfamiliar, that is, even in the context of the earlier discussion of dominical categories. This novelty is perhaps mitigated by the fact that, however unfamiliar, they cannot be said to be unusual, as the discussion later will show. We mention in particular those of a “formally free semigroup”, which retains the indexation function of a free semigroup, while giving up the characteristic universal property and that of “uniform generation”, which generalizes finite generation in the fashion assorted to our argument.

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Naumann, Niko. "Linear Relations Among the Values of Canonical Heights from the Existence of Non-Trivial Endomorphisms." Canadian Mathematical Bulletin 47, no. 2 (June 1, 2004): 271–79. http://dx.doi.org/10.4153/cmb-2004-027-5.

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AbstractWe study the interplay between canonical heights and endomorphisms of an abelian variety A over a number field k. In particular we show that whenever the ring of endomorphisms defined over k is strictly larger than there will be -linear relations among the values of a canonical height pairing evaluated at a basis modulo torsion of A(k).

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Ahmad, Bashir, Sotiris K. Ntouyas, and Hamed H. Alsulami. "Existence Theory for th Order Nonlocal Integral Boundary Value Problems and Extension to Fractional Case." Abstract and Applied Analysis 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/183813.

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This paper is devoted to the study of the existence and uniqueness of solutions for th order differential equations with nonlocal integral boundary conditions. Our results are based on a variety of fixed point theorems. Some illustrative examples are discussed. We also discuss the Caputo type fractional analogue of the higher-order problem of ordinary differential equations.

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Aqlan, Mohammed H., Ahmed Alsaedi, Bashir Ahmad, and Juan J. Nieto. "Existence theory for sequential fractional differential equations with anti-periodic type boundary conditions." Open Mathematics 14, no. 1 (January 1, 2016): 723–35. http://dx.doi.org/10.1515/math-2016-0064.

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AbstractWe develop the existence theory for sequential fractional differential equations involving Liouville-Caputo fractional derivative equipped with anti-periodic type (non-separated) and nonlocal integral boundary conditions. Several existence criteria depending on the nonlinearity involved in the problems are presented by means of a variety of tools of the fixed point theory. The applicability of the results is shown with the aid of examples. Our results are not only new in the given configuration but also yield some new special cases for specific choices of parameters involved in the problems.

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O'Connor, Pat. "Irish Young People's Narratives: The Existence of Gender Differentiated Cultures?" Irish Journal of Sociology 17, no. 1 (May 2009): 95–114. http://dx.doi.org/10.7227/ijs.17.1.7.

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There is frequently an assumption that fixed dualisms are no longer relevant (Thorne 1993) so that socially constructed and differentially valued gendered cultures no longer exist. Gender, however, has not been consistently referred to as an outdated or zombie category (Beck and Beck-Gernsheim 2002), while a variety of evidence suggests that male priorities, choices and lifestyles are differentially valued (UN 1995; O'Connor 2000). Drawing on a national one in ten random sample of 4,100 texts written by Irish young people, typically aged 10–12 and 14–17 years, in response to an invitation to describe ‘themselves and the Ireland they inhabit’, this article suggests that aspects of their narratives (relating to relationships and lifestyles) reflect the existence of gender differentiated cultures, although these ‘two cultures’ are much less apparent in their narratives about time, space and consumption. Finally, the paper touches on the implications of these trends for understanding contemporary Irish society.

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Sitowati, Inggit. "Existence, Identity and Survive Strategy Kethoprak Tobong Kelana Bhakti Budaya." International Journal of Creative and Arts Studies 2, no. 1 (February 12, 2017): 63. http://dx.doi.org/10.24821/ijcas.v2i1.1439.

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Kethoprak Tobong Kelana Bhakti Budaya is one of Ketoprak tobong that still exist and survive from the onslaught of modern entertainment. Ketoprak tobong is a traditional Javanese theatrical art which performs and lives by moving from one place to another within a period of time. They maintain their existence because of their deep love for the Ketoprak world. In addition they have a sense of responsibility to preserve the nation’s cultural heritage by maintaining their tobong group. For them the Ketoprak world and tobong is their identity. The members of this group were born and grew up from the Ketoprak’s family and environment. The existence and identity of this group is formed from habitus, capital and field. For survive strategy, they apply the principles of kinship, flexibly apply the rules, looking for donors, and promotes the group through a variety of cultural events. To make ends meet they have other jobs, including craft, making costumes, makeup, and a singer in a wedding.

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Praveen, E., S. Murugan, and K. Jayakumar. "Investigations on the existence of piezoelectric property of a bio-polymer – chitosan and its application in vibration sensors." RSC Advances 7, no. 56 (2017): 35490–95. http://dx.doi.org/10.1039/c7ra04752e.

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LEWIS, MARK, and ABBAS MOAMENI. "A NEW VARIATIONAL FORMULATION FOR CONVEX HAMILTONIAN SYSTEMS WITH NONLINEAR BOUNDARY CONDITIONS." Bulletin of the Australian Mathematical Society 84, no. 2 (July 13, 2011): 186–204. http://dx.doi.org/10.1017/s0004972711002425.

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AbstractA variational principle is established to provide a new formulation for convex Hamiltonian systems. Using this formulation, we obtain some existence results for second-order Hamiltonian systems with a variety of boundary conditions, including nonlinear ones.

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Terkourafi, Marina. "Understanding the present through the past." Diachronica 22, no. 2 (December 7, 2005): 309–72. http://dx.doi.org/10.1075/dia.22.2.04ter.

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Studies of Greek as spoken today in Cyprus draw attention to a generalised variety of Cypriot Greek, free from local variation within the island, yet diverging in several ways from the standard spoken on the mainland. In this article, I attempt first to classify this variety, examining whether it exhibits structural and sociohistorical characteristics of koinés. Having established today's generalised Cypriot variety as a koiné, I then trace its evolution, arguing that an early koiné already came into existence in the late 14th c., playing an important role in the formation of both the modern Cypriot dialect and today's koiné.

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Guo, Zongming. "Existence of positive radial solutions for a class of nonlinear singular elliptic problems in annular domains." Proceedings of the Edinburgh Mathematical Society 35, no. 3 (October 1992): 405–18. http://dx.doi.org/10.1017/s0013091500005691.

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We establish the existence of positive radially symmetric solutions of Δu+f(r,u,u′) = 0 in the domainR1<r<R0with a variety of Dirichlet and Neumann boundary conditions. The functionfis allowed to be singular when eitheru= 0 oru′ = 0. Our analysis is based on Leray-Schauder degree theory.

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Magalhães, Carolina, Maria Ferreira, Rita Reis, Fernanda Silva, Taciana Santos, and Renata Campina. "Existence of Enlarged Parietal Foramina in Bone Collections." Journal of Morphological Sciences 35, no. 02 (June 2018): 125–28. http://dx.doi.org/10.1055/s-0038-1669433.

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Introduction The enlarged parietal foramen (EPF) is a defect in the ossification of the parietal bone that is well described in the literature using a variety of nomenclatures. Individuals with EPF can present symptoms such as migraines, vomiting and intense pain when light pressure is applied to the skull. However, it can go unnoticed for a lifetime. Materials and Methods At the Human Bone Collection department of the Universidade Federal de Pernambuco, 2 craniums (CAV 90, 96 years old and CAV 16, 81 years old) and were identified as having EPF, both from females. Results There was no apparent kinship between both craniums. The sagittal length, the coronal width, the sagittal suture distance, the coronal suture distance and the lambdoid suture distance of each enlarged parietal foramen were evaluated, with the following results: sagittal length: 5.5 cm (CAV 90), and 5.0 cm (CAV 16); coronal width: 3.1 cm (CAV 90),and 3.4 cm (CAV 16); sagittal suture distance: 2.9 cm (CAV 90), and 2.3 cm (CAV 16); coronal suture distance: 1.8 cm (CAV 90), and 4.6 cm (CAV 16); and lambdoid suture distance: 5.0 cm (CAV 90), and 3.0 cm (CAV 16). The parietal foramen of both craniums exhibited equivalent measurements. Conclusion Due to the low incidence of EPF, the identification of the 2 craniums with this condition in a collection of 105 skeletons makes the discovery relevant. In reference to craniums exhibiting EPF, this is an important tool for study and forensic research, since its appearance is linked to heredity.

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Shiohara, M., WS el-Deiry, M. Wada, T. Nakamaki, S. Takeuchi, R. Yang, DL Chen, B. Vogelstein, and HP Koeffler. "Absence of WAF1 mutations in a variety of human malignancies." Blood 84, no. 11 (December 1, 1994): 3781–84. http://dx.doi.org/10.1182/blood.v84.11.3781.bloodjournal84113781.

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A newly cloned gene named wild-type p53-activated fragment 1 (WAF1; also known as p21, Pic-1, Cip-1, or SDI1) is directly regulated by p53 and can itself suppress tumor cell growth in culture. Induction of expression of WAF1 may be an important means by which cells with DNA injury arrest their growth to repair DNA or undergo apoptosis. Based on the hypothesis that mutations of this gene may play a role in carcinogenesis, we have studied 351 DNAs from 14 kinds of malignancies, as well as 36 human transformed cell lines, for alterations of WAF1 gene by single-strand conformation polymorphism analysis of polymerase chain reaction amplification of the DNA coding region of the WAF1 gene. No abnormal band shifts of WAF1 were noted in any of the samples or cell lines, but three major variants in exons 2 and 3 of the gene were found that are consistent with the existence of two different DNA polymorphisms. Sequence analysis of the amplified products producing these three variants in each exon from normal DNAs confirmed the presence of the polymorphisms in the WAF1 gene. Of 290 selected tumor samples previously evaluated for p53 mutations by single-strand conformation polymorphism, 90% had no detectable p53 alterations. In summary, mutations within the coding portion of the WAF1 gene were undetectable in a large series of human tumors, many of which had a normal p53 gene. This suggests that WAF1 alterations are generally caused indirectly, through p53 mutations rather than through intragenic mutation of the WAF1 itself.

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Journal articles on the topic 'Existence variety'

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