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Articles de revues sur le sujet « Existence-nonexistence »

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Auteur : Grafiati

Publié le 11 mars 2023

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1

Einheuser, Iris. « Nonexistence, Vague Existence, Merely Possible Existence ». Disputatio 4, n^o 33 (1 novembre 2012) : 427–43. http://dx.doi.org/10.2478/disp-2012-0009.

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Abstract This paper explores a new non-deflationary approach to the puzzle of nonexistence and its cousins. On this approach, we can, under a plausible assumption, express true de re propositions about certain objects that don’t exist, exist indeterminately or exist merely possibly. The defense involves two steps: First, to argue that if we can actually designate what individuates a nonexistent target object with respect to possible worlds in which that object does exist, then we can express a de re proposition about “it”. Second, to adapt the concept of outer truth with respect to a possible world – a concept familiar from actualist modal semantics – for use in representing the actual world.

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2

Adámek, J. « Existence and Nonexistence of Regular Generators ». Canadian Mathematical Bulletin 37, n^o 1 (1 mars 1994) : 3–7. http://dx.doi.org/10.4153/cmb-1994-001-9.

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3

Moss, Lawrence. « Existence and nonexistence of universal graphs ». Fundamenta Mathematicae 133, n^o 1 (1989) : 25–37. http://dx.doi.org/10.4064/fm-133-1-25-37.

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4

Bernal-González, L., et K. G. Grosse-Erdmann. « Existence and nonexistence of hypercyclic semigroups ». Proceedings of the American Mathematical Society 135, n^o 3 (31 août 2006) : 755–66. http://dx.doi.org/10.1090/s0002-9939-06-08524-8.

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5

Tabachnikov, Serge. « Existence and nonexistence of skew branes ». Journal of Fixed Point Theory and Applications 7, n^o 2 (23 juillet 2010) : 419–31. http://dx.doi.org/10.1007/s11784-010-0015-y.

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6

Durhuus, Bergfinnur, Thordur Jonsson et Ryszard Nest. « Noncommutative scalar solitons : existence and nonexistence ». Physics Letters B 500, n^o 3-4 (février 2001) : 320–25. http://dx.doi.org/10.1016/s0370-2693(01)00086-7.

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7

Freydenberger, Dominik D., et Daniel Reidenbach. « Existence and nonexistence of descriptive patterns ». Theoretical Computer Science 411, n^o 34-36 (juillet 2010) : 3274–86. http://dx.doi.org/10.1016/j.tcs.2010.05.033.

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8

Ma, Zhaohai, et Rong Yuan. « Traveling wave solutions of a nonlocal dispersal SIRS model with spatio-temporal delay ». International Journal of Biomathematics 10, n^o 05 (9 mai 2017) : 1750071. http://dx.doi.org/10.1142/s1793524517500711.

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This paper is mainly concerned with the existence and nonexistence of traveling wave solutions of a nonlocal dispersal SIRS model with nonlocal delayed transmissions. We find that the existence and nonexistence of traveling wave solutions are determined by the critical wave speed [Formula: see text]. More specifically, we establish the existence of traveling wave solutions for every wave speed [Formula: see text] and [Formula: see text] by means of upper-lower solutions and Schauder’s fixed point theorem. Nonexistence of traveling wave solutions is obtained by Laplace transform for any wave speed [Formula: see text] and [Formula: see text].

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9

Wang, Shin-Hwa, et Nicholas D. Kazarinoff. « On positive solutions of some semilinear elliptic equations ». Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics 50, n^o 3 (juin 1991) : 343–55. http://dx.doi.org/10.1017/s144678870003295x.

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AbstractThe existence of positive solutions of some semilinear elliptic equations of the form −Δu = λf(u) is studied. The major results are a nonexistence theorem which gives a λ* = λ*(f,Ω) > 0 below which no positive solutions exist and a lower bound theorem for umax for Ω a ball. As a corollary of the nonexistence theorem that describes the dependence of the number of solutions on λ, two other nonexistence theorems, and an existence theorem are also proved.

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10

Jleli, Mohaemd, et Bessem Samet. « On Local Weak Solutions for Fractional in Time SOBOLEV-Type Inequalities ». Journal of Function Spaces 2020 (23 septembre 2020) : 1–7. http://dx.doi.org/10.1155/2020/4867186.

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We consider two fractional in time nonlinear Sobolev-type inequalities involving potential terms, where the fractional derivatives are defined in the sense of Caputo. For both problems, we study the existence and nonexistence of nontrivial local weak solutions. Namely, we show that there exists a critical exponent according to which we have existence or nonexistence.

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11

Black, Isra. « Novel Beings and Assisted Nonexistence ». Cambridge Quarterly of Healthcare Ethics 30, n^o 3 (10 juin 2021) : 543–55. http://dx.doi.org/10.1017/s0963180120001085.

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AbstractThis article engages with the legal regulation of end-of-existence decisionmaking for novel beings, specifically assisted nonexistence for such entities. The author explains the concept of a legal model for assisted death by reference to the substantive features of legal regimes in three jurisdictions in which assisted suicide or euthanasia is lawful. He considers how these models might fit novel beings who may require or prefer assistance to end their own existence by reference to the constituent features—abstract legal ingredients—that models for assisted death share. The author argues that extant models may block some novel beings’ access to end-of-existence assistance or fail to track what matters to them. He then examines the merits of adopting a universal model for assisted nonexistence, that is, a legal framework whose substantive features capture the end-of-existence concerns of both human and novel beings. Consideration of a unified legal framework may illuminate the discussion of assisted nonexistence for humans and novel beings. However, the paper proposes that whereas novel beings may have similar interests to humans, they may be relevantly different also. The prima facie case for adopting a one regime to rule us all approach to assisted nonexistence may be defeated by reasons for divergent regulation.

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12

CATRINA, FLORIN, et RICHARD LAVINE. « RADIAL SOLUTIONS FOR WEIGHTED SEMILINEAR EQUATIONS ». Communications in Contemporary Mathematics 04, n^o 03 (août 2002) : 529–45. http://dx.doi.org/10.1142/s0219199702000750.

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In this paper we prove the exact cut-off between existence and nonexistence of radial solutions in a class of problems of the Brezis–Nirenberg type. We obtain this by studying the existence/nonexistence of positive solutions in [Formula: see text] for -vtt+¼v=vp-1 +λe-ctv, for different values of the parameters c>0 and λ, for p≥2.

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13

Wu, Tianqi. « Contradiction Medium and the Existence Question ». Proceedings 47, n^o 1 (15 mai 2020) : 46. http://dx.doi.org/10.3390/proceedings2020047046.

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The process of human understanding of the world starts from viewing complex chaos, proceeding to monism followed by the contradiction theory, and finally returning to complexity theory, but without giving up the pursuit of monism. Lao-Tzu and Heraclitus put forward their own theories of unity of opposites at almost the same time. The thought of unity of opposites has long been contained in the theory of yin and yang and the Book of Changes. In the ontology of information evolution, existence and nonexistence (you and wu in Chinese) can also be roughly interpreted as a contradictory relationship. Existence and nonexistence are two opposing worlds. Our understanding of existence needs medium. We can only indirectly grasp the current meaning of existence after the transmission of multilayer mediums and the distortion and loss of information. Aristotle mentioned the notion of medium, but the real world cannot be explained by his ideas. All transformational processes of existence rely on medium. The transformation process of existence and nonexistence is different from the transformation process in the domain of existence. There is no need to rely on medium.

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14

Wu, Tianqi. « Contradiction Medium and the Existence Question ». Proceedings 47, n^o 1 (15 mai 2020) : 46. http://dx.doi.org/10.3390/proceedings47010046.

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The process of human understanding of the world starts from viewing complex chaos, proceeding to monism followed by the contradiction theory, and finally returning to complexity theory, but without giving up the pursuit of monism. Lao-Tzu and Heraclitus put forward their own theories of unity of opposites at almost the same time. The thought of unity of opposites has long been contained in the theory of yin and yang and the Book of Changes. In the ontology of information evolution, existence and nonexistence (you and wu in Chinese) can also be roughly interpreted as a contradictory relationship. Existence and nonexistence are two opposing worlds. Our understanding of existence needs medium. We can only indirectly grasp the current meaning of existence after the transmission of multilayer mediums and the distortion and loss of information. Aristotle mentioned the notion of medium, but the real world cannot be explained by his ideas. All transformational processes of existence rely on medium. The transformation process of existence and nonexistence is different from the transformation process in the domain of existence. There is no need to rely on medium.

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15

Li, Yunhong, et Weihua Jiang. « Existence and Nonexistence of Positive Solutions for Fractional Three-Point Boundary Value Problems with a Parameter ». Journal of Function Spaces 2019 (3 janvier 2019) : 1–10. http://dx.doi.org/10.1155/2019/9237856.

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In this work, we investigate the existence and nonexistence of positive solutions for p-Laplacian fractional differential equation with a parameter. On the basis of the properties of Green’s function and Guo-Krasnosel’skii fixed point theorem on cones, the existence and nonexistence of positive solutions are obtained for the boundary value problems. We also give some examples to illustrate the effectiveness of our main results.

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16

Yang, Wengui. « Eigenvalue problems for a class of nonlinear Hadamard fractional differential equations with p-Laplacian operator ». Mathematica Slovaca 70, n^o 1 (25 février 2020) : 107–24. http://dx.doi.org/10.1515/ms-2017-0336.

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AbstractThis paper is concerned with the existence and nonexistence of positive solutions for the eigenvalue problems of nonlinear Hadamard fractional differential equations with p-Laplacian operator. By applying the properties of the Green function and Guo-Krasnosel’skii fixed point theorem on cones, some existence and nonexistence results of positive solutions are obtained based on different eigenvalue intervals. Finally, some examples are presented to demonstrate the feasibility of our main results.

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17

Maia, Liliane, Gabrielle Nornberg et Filomena Pacella. « Existence, nonexistence and uniqueness for Lane–Emden type fully nonlinear systems ». Nonlinearity 36, n^o 3 (1 février 2023) : 1510–46. http://dx.doi.org/10.1088/1361-6544/acb399.

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Abstract We study existence, nonexistence, and uniqueness of positive radial solutions for a class of nonlinear systems driven by Pucci extremal operators under a Lane–Emden coupling configuration. Our results are based on the analysis of the associated quadratic dynamical system and energy methods. For both regular and exterior domain radial solutions we obtain new regions of existence and nonexistence. Besides, we show an exclusion principle for regular solutions, either in R N or in a ball, by exploiting the uniqueness of trajectories produced by the flow. In particular, for the standard Lane–Emden system involving the Laplacian operator, we prove that the critical hyperbola of regular radial positive solutions is also the threshold for existence and nonexistence of radial exterior domain solutions with Neumann boundary condition. As a byproduct, singular solutions with fast decay at infinity are also found.

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18

Alazman, Ibtehal, Ibtisam Aldawish, Mohamed Jleli et Bessem Samet. « A higher order evolution inequality with a gradient term in the exterior of the half-ball ». AIMS Mathematics 8, n^o 4 (2023) : 9230–46. http://dx.doi.org/10.3934/math.2023463.

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<abstract><p>We study the existence and nonexistence of weak solutions to a semilinear higher order (in time) evolution inequality involving a convection term in the exterior of the half-ball, under Dirichlet-type boundary conditions. A weight function of the form $ |x|^a $ is allowed in front of the power nonlinearity. When $ a > -2 $, we show that the dividing line with respect to existence or nonexistence is given by a critical exponent (Fujita critical exponent), which depends on the parameters of the problem, but independent of the order of the time-derivative. Our study yields naturally optimal nonexistence results for the corresponding stationary problem.</p></abstract>

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19

SHUI, SHULIANG, JINGJING LI et XUYANG ZHANG. « NONRESONANT BIFURCATIONS OF HETEROCLINIC LOOPS WITH ONE INCLINATION FLIP ». International Journal of Bifurcation and Chaos 21, n^o 01 (janvier 2011) : 255–73. http://dx.doi.org/10.1142/s0218127411028404.

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Heteroclinic bifurcations in four-dimensional vector fields are investigated by setting up local coordinates near a heteroclinic loop. This heteroclinic loop consists of two principal heteroclinic orbits, but there is one stable foliation that involves an inclination flip. The existence, nonexistence, coexistence and uniqueness of the 1-heteroclinic loop, 1-homoclinic orbit, and 1-periodic orbit are studied. Also, the nonexistence, existence of the 2-homoclinic and 2-periodic orbit are demonstrated.

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20

Pott, A., et S. P. Bradley. « Existence and nonexistence of almost-perfect autocorrelation sequences ». IEEE Transactions on Information Theory 41, n^o 1 (1995) : 301–4. http://dx.doi.org/10.1109/18.370094.

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21

Shipman, Stephen, et Darko Volkov. « Guided Modes in Periodic Slabs : Existence and Nonexistence ». SIAM Journal on Applied Mathematics 67, n^o 3 (janvier 2007) : 687–713. http://dx.doi.org/10.1137/050647189.

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22

Li, Yuxiang, Weibing Deng et Chunhong Xie. « Global existence and nonexistence for degenerate parabolic systems ». Proceedings of the American Mathematical Society 130, n^o 12 (14 mai 2002) : 3661–70. http://dx.doi.org/10.1090/s0002-9939-02-06630-3.

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23

Jiaxing, Hong, et Liu Jiaqian. « On existence and nonexistence of some harmonic maps ». Acta Mathematica Sinica 6, n^o 1 (mars 1990) : 1–9. http://dx.doi.org/10.1007/bf02108857.

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24

Bandle, Catherine, Fabio Punzo et Alberto Tesei. « Existence and nonexistence of patterns on Riemannian manifolds ». Journal of Mathematical Analysis and Applications 387, n^o 1 (mars 2012) : 33–47. http://dx.doi.org/10.1016/j.jmaa.2011.08.060.

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25

Huh, Hyungjin, Yuanfeng Jin, Youwei Ma et Guanghui Jin. « Standing wave solution for the generalized Jackiw-Pi model ». Advances in Nonlinear Analysis 12, n^o 1 (13 septembre 2022) : 369–82. http://dx.doi.org/10.1515/anona-2022-0261.

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Abstract We study the existence and nonexistence of the standing wave solution for the generalized Jackiw-Pi model by using variational method. Depending on interaction strength λ \lambda , we have three different situations. The existence and nonexistence of the standing wave solution correspond to 1 < λ 1\lt \lambda and 0 < λ < 1 0\lt \lambda \lt 1 , respectively. We have the explicit solution of self-dual equation for the borderline λ = 1 \lambda =1 .

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26

Hunt, Marcus William. « Asymmetry and the Afterlife ». National Catholic Bioethics Quarterly 19, n^o 3 (2019) : 377–89. http://dx.doi.org/10.5840/ncbq201919328.

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According to David Benatar’s asymmetry argument, the transition from nonexistence to existence is always a harm, and procreation always a pro tanto wrong. This argument fails to reach its anti-natalist conclusion if we maintain the view that there is no temporal relationship between our worldly lives and our afterlives. On this view, since anyone who will be freely procreated has an existence in the afterlife that is atemporal with respect to worldly time, procreators do not move those they procreate from nonexistence to existence and so do not harm them. This view provides a reason to reject Benatar’s stringent “life worth starting” criterion for procreation.

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27

A., Iaia Joseph. « Existence and Nonexistence for Semilinear Equations on Exterior Domains ». Journal of Partial Differential Equations 30, n^o 4 (juin 2017) : 299–316. http://dx.doi.org/10.4208/jpde.v30.n4.2.

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28

Dai, Limei. « Existence and nonexistence of subsolutions for augmented Hessian equations ». Discrete & ; Continuous Dynamical Systems - A 40, n^o 1 (2020) : 579–96. http://dx.doi.org/10.3934/dcds.2020023.

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29

Giri, Ankik Kumar, et Philippe Laurençot. « Existence and NonExistence for the Collision-Induced Breakage Equation ». SIAM Journal on Mathematical Analysis 53, n^o 4 (janvier 2021) : 4605–36. http://dx.doi.org/10.1137/20m1386852.

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30

Dierkes, Ulrich, et Gerhard Huisken. « Then-dimensional analogue of the catenary : existence and nonexistence ». Pacific Journal of Mathematics 141, n^o 1 (1 janvier 1990) : 47–54. http://dx.doi.org/10.2140/pjm.1990.141.47.

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31

Pohozaev, Stanislav I., et Alberto Tesei. « Existence and Nonexistence of Solutions of Nonlinear Neumann Problems ». SIAM Journal on Mathematical Analysis 31, n^o 1 (janvier 1999) : 119–33. http://dx.doi.org/10.1137/s0036141098334948.

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32

Bobisud, L. E., D. O'Regan et W. D. Royalty. « Existence and nonexistence for a singular boundary value problem ». Applicable Analysis 28, n^o 4 (janvier 1988) : 245–56. http://dx.doi.org/10.1080/00036818808839765.

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33

Lancaster, Kirk E. « Existence and nonexistence of radial limits of minimal surfaces ». Proceedings of the American Mathematical Society 106, n^o 3 (1 mars 1989) : 757. http://dx.doi.org/10.1090/s0002-9939-1989-0969523-6.

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34

He, Wei, Dongdong Qin et Qingfang Wu. « Existence, multiplicity and nonexistence results for Kirchhoff type equations ». Advances in Nonlinear Analysis 10, n^o 1 (30 octobre 2020) : 616–35. http://dx.doi.org/10.1515/anona-2020-0154.

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Abstract In this paper, we study following Kirchhoff type equation: $$\begin{array}{} \left\{ \begin{array}{lll} -\left(a+b\int_{{\it\Omega}}|\nabla u|^2 \mathrm{d}x \right){\it\Delta} u=f(u)+h~~&\mbox{in}~~{\it\Omega}, \\ u=0~~&\mbox{on}~~ \partial{\it\Omega}. \end{array} \right. \end{array}$$ We consider first the case that Ω ⊂ ℝ3 is a bounded domain. Existence of at least one or two positive solutions for above equation is obtained by using the monotonicity trick. Nonexistence criterion is also established by virtue of the corresponding Pohožaev identity. In particular, we show nonexistence properties for the 3-sublinear case as well as the critical case. Under general assumption on the nonlinearity, existence result is also established for the whole space case that Ω = ℝ3 by using property of the Pohožaev identity and some delicate analysis.

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35

Ghaderpour, Ebrahim. « Some Nonexistence and Asymptotic Existence Results for Weighing Matrices ». International Journal of Combinatorics 2016 (13 mars 2016) : 1–6. http://dx.doi.org/10.1155/2016/2162849.

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Orthogonal designs and weighing matrices have many applications in areas such as coding theory, cryptography, wireless networking, and communication. In this paper, we first show that if positive integer k cannot be written as the sum of three integer squares, then there does not exist any skew-symmetric weighing matrix of order 4n and weight k, where n is an odd positive integer. Then we show that, for any square k, there is an integer N(k) such that, for each n≥N(k), there is a symmetric weighing matrix of order n and weight k. Moreover, we improve some of the asymptotic existence results for weighing matrices obtained by Eades, Geramita, and Seberry.

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36

Wang, Haiyan. « Existence and nonexistence of positive solutions for quasilinear systems ». Boundary Value Problems 2006 (2006) : 1–9. http://dx.doi.org/10.1155/bvp/2006/71534.

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37

Feng, Zhaosheng, et Lei Wei. « Existence and nonexistence of solutions for quasilinear elliptic systems ». Dynamics of Partial Differential Equations 10, n^o 1 (2013) : 25–42. http://dx.doi.org/10.4310/dpde.2013.v10.n1.a2.

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38

Giacomini, H., J. Llibre et M. Viano. « On the nonexistence, existence and uniqueness of limit cycles ». Nonlinearity 9, n^o 2 (1 mars 1996) : 501–16. http://dx.doi.org/10.1088/0951-7715/9/2/013.

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39

Adelstein, Ian M. « Existence and nonexistence of half-geodesics on $S^2$ ». Proceedings of the American Mathematical Society 144, n^o 7 (22 mars 2016) : 3085–91. http://dx.doi.org/10.1090/proc/12918.

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40

Montenegro, Marcelo, et Marcos Montenegro. « Existence and Nonexistence of Solutions for Quasilinear Elliptic Equations ». Journal of Mathematical Analysis and Applications 245, n^o 2 (mai 2000) : 303–16. http://dx.doi.org/10.1006/jmaa.1999.6697.

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41

Messaoudi, Salim A. « Global Existence and Nonexistence in a System of Petrovsky ». Journal of Mathematical Analysis and Applications 265, n^o 2 (janvier 2002) : 296–308. http://dx.doi.org/10.1006/jmaa.2001.7697.

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42

Xu, Zhiguo, Shaoyun Shi et Fang Liu. « Nonexistence and partial existence of first integrals for diffeomorphisms ». Applied Mathematics Letters 23, n^o 4 (avril 2010) : 399–403. http://dx.doi.org/10.1016/j.aml.2009.11.006.

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43

Dávila, Gonzalo, Alexander Quaas et Erwin Topp. « Existence, nonexistence and multiplicity results for nonlocal Dirichlet problems ». Journal of Differential Equations 266, n^o 9 (avril 2019) : 5971–97. http://dx.doi.org/10.1016/j.jde.2018.10.046.

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44

Fragalà, Ilaria, Filippo Gazzola et Bernd Kawohl. « Existence and nonexistence results for anisotropic quasilinear elliptic equations ». Annales de l'Institut Henri Poincare (C) Non Linear Analysis 21, n^o 5 (septembre 2004) : 715–34. http://dx.doi.org/10.1016/j.anihpc.2003.12.001.

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45

Saoudi, K. « Existence and Nonexistence of Positive Solutions for Quasilinear Elliptic Problem ». Abstract and Applied Analysis 2012 (2012) : 1–9. http://dx.doi.org/10.1155/2012/275748.

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46

KIM, CHAN-GYUN, et YONG-HOON LEE. « EXISTENCE OF MULTIPLE POSITIVE SOLUTIONS FOR p-LAPLACIAN PROBLEMS WITH A GENERAL INDEFINITE WEIGHT ». Communications in Contemporary Mathematics 10, n^o 03 (juin 2008) : 337–62. http://dx.doi.org/10.1142/s021919970800279x.

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This paper studies the existence of positive solutions for a class of singular boundary value problems of p-Laplacian. By using Global Continuation Theorem and the fixed point index technique, criteria of the existence, multiplicity and nonexistence of positive solutions are established.

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47

Du, Miao, Lixin Tian, Jun Wang et Fubao Zhang. « Existence of normalized solutions for nonlinear fractional Schrödinger equations with trapping potentials ». Proceedings of the Royal Society of Edinburgh : Section A Mathematics 149, n^o 03 (27 décembre 2018) : 617–53. http://dx.doi.org/10.1017/prm.2018.41.

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AbstractIn this paper, we study the existence, nonexistence and mass concentration of L2-normalized solutions for nonlinear fractional Schrödinger equations. Comparingwith the Schrödinger equation, we encounter some new challenges due to the nonlocal nature of the fractional Laplacian. We first prove that the optimal embedding constant for the fractional Gagliardo–Nirenberg–Sobolev inequality can be expressed by exact form, which improves the results of [17, 18]. By doing this, we then establish the existence and nonexistence of L2-normalized solutions for this equation. Finally, under a certain type of trapping potentials, by using some delicate energy estimates we present a detailed analysis of the concentration behavior of L2-normalized solutions in the mass critical case.

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48

Yang, Yisong. « Global spatially periodic solutions to the Ginzburg–Landau equation ». Proceedings of the Royal Society of Edinburgh : Section A Mathematics 110, n^o 3-4 (1988) : 263–73. http://dx.doi.org/10.1017/s0308210500022253.

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49

BENALILI, MOHAMMED. « NODAL SOLUTIONS TO QUASILINEAR ELLIPTIC EQUATIONS ON COMPACT RIEMANNIAN MANIFOLDS ». Communications in Contemporary Mathematics 12, n^o 06 (décembre 2010) : 909–37. http://dx.doi.org/10.1142/s0219199710004032.

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50

Sun, Yongping, Qian Sun et Xiaoping Zhang. « Existence and Nonexistence of Positive Solutions for a Higher-Order Three-Point Boundary Value Problem ». Abstract and Applied Analysis 2014 (2014) : 1–7. http://dx.doi.org/10.1155/2014/513051.

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This paper is concerned with the existence and nonexistence of positive solutions for a nonlinear higher-order three-point boundary value problem. The existence results are obtained by applying a fixed point theorem of cone expansion and compression of functional type due to Avery, Henderson, and O’Regan.

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