Academic literature on the topic 'Steinberg variety'
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Journal articles on the topic "Steinberg variety":
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Lusztig, G. "Constructible Functions on the Steinberg Variety." Advances in Mathematics 130, no. 2 (September 1997): 287–310. http://dx.doi.org/10.1006/aima.1997.1668.
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Douglass, J. Matthew, and Gerhard Röhrle. "The Steinberg variety and representations of reductive groups." Journal of Algebra 321, no. 11 (June 2009): 3158–96. http://dx.doi.org/10.1016/j.jalgebra.2008.10.027.
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Douglass, J. M., and G. Röhrle. "Homology of the Steinberg variety and Weyl group coinvariants." Documenta Mathematica 14 (2009): 339–57. http://dx.doi.org/10.4171/dm/275.
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Kwon, Namhee. "Borel-Moore homology and K -theory on the Steinberg variety." Michigan Mathematical Journal 58, no. 3 (December 2009): 771–81. http://dx.doi.org/10.1307/mmj/1260475700.
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Rosso, Daniele. "Classic and Mirabolic Robinson–Schensted–Knuth Correspondence for Partial Flags." Canadian Journal of Mathematics 64, no. 5 (October 1, 2012): 1090–121. http://dx.doi.org/10.4153/cjm-2011-071-7.
Abstract:
Abstract In this paper we first generalize to the case of partial flags a result proved both by Spaltenstein and by Steinberg that relates the relative position of two complete flags and the irreducible components of the flag variety in which they lie, using the Robinson-Schensted-Knuth correspondence. Then we use this result to generalize the mirabolic Robinson-Schensted-Knuth correspondence defined by Travkin, to the case of two partial flags and a line.
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Belsky, Jay. "War, trauma and children's development: Observations from a modern evolutionary perspective." International Journal of Behavioral Development 32, no. 4 (July 2008): 260–71. http://dx.doi.org/10.1177/0165025408090969.
Abstract:
Lethal intergroup conflict has been part of the human experience ever since our species emerged on the African savannah. Modern evolutionary thinking suggests that children's development could have evolved a variety of responses to it, some of which are highlighted upon considering, from the field of behavioural ecology, life-history theory and, derived from it, Belsky, Steinberg and Draper's (1991) evolutionary theory of socialization. This speculative essay examines the implications of such thinking, specifically with regard to insecure attachment, anxiety, depression, aggression, pubertal and sexual development, as well as mating and parenting. Considered, too, are issues of intergenerational transmission and variation in developmental reactivity to exposure to deadly political violence of the ethnic-cleansing variety in childhood.
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Ballester-Bolinches, A., and V. Pérez-Calabuig. "The Abelian Kernel of an Inverse Semigroup." Mathematics 8, no. 8 (July 24, 2020): 1219. http://dx.doi.org/10.3390/math8081219.
Abstract:
The problem of computing the abelian kernel of a finite semigroup was first solved by Delgado describing an algorithm that decides whether a given element of a finite semigroup S belongs to the abelian kernel. Steinberg extended the result for any variety of abelian groups with decidable membership. In this paper, we used a completely different approach to complete these results by giving an exact description of the abelian kernel of an inverse semigroup. An abelian group that gives this abelian kernel was also constructed.
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Netto, Willem J., Peter L. H. Hanegraaf, and Han DE VRIES. "Matman: a Program for the Analysis of Sociometric Matrices and Behavioural Transition Matrices." Behaviour 125, no. 3-4 (1993): 157–75. http://dx.doi.org/10.1163/156853993x00218.
Abstract:
AbstractMatMan is a program for performing a variety of ethological analyses of frequency (interaction) matrices and transition matrices. These analyses include linear hierarchy indices for dominance matrices (APPLEBY, 1983), reorganization of a dominance matrix such that the subjects are in rank order, matrix correlation methods such as Mantel's test (MANTEL, 1967) and rowwise matrix correlation (DE VRIES, 1993), methods based on information theory (STEINBERG, 1977), and the calculation of expected and residual values in transition matrices with defined or undefined diagonal. In addition, MatMan offers some useful options for manipulating matrices. Import of matrices from The Observer (NOLDUS, 1991) and SAS is, within certain limitations, possible. Export of matrices is possible to the programs CORAN (1985), Vegrow (FRESCO, 1989), NCSS (HINTZE, 1987), SAS and SPSSPC.
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Fujita, Ryo. "Affine highest weight categories and quantum affine Schur-Weyl duality of Dynkin quiver types." Representation Theory of the American Mathematical Society 26, no. 8 (March 18, 2022): 211–63. http://dx.doi.org/10.1090/ert/601.
Abstract:
For a Dynkin quiver Q Q (of type A D E \mathrm {ADE} ), we consider a central completion of the convolution algebra of the equivariant K K -group of a certain Steinberg type graded quiver variety. We observe that it is affine quasi-hereditary and prove that its category of finite-dimensional modules is identified with a block of Hernandez-Leclerc’s monoidal category C Q \mathcal {C}_{Q} of modules over the quantum loop algebra U q ( L g ) U_{q}(L\mathfrak {g}) via Nakajima’s homomorphism. As an application, we show that Kang-Kashiwara-Kim’s generalized quantum affine Schur-Weyl duality functor gives an equivalence between the category of finite-dimensional modules over the quiver Hecke algebra associated with Q Q and Hernandez-Leclerc’s category C Q \mathcal {C}_{Q} , assuming the simpleness of some poles of normalized R R -matrices for type E \mathrm {E} .
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Phillips, Steven, and Jane Elith. "Logistic Methods for Resource Selection Functions and Presence-Only Species Distribution Models." Proceedings of the AAAI Conference on Artificial Intelligence 25, no. 1 (August 4, 2011): 1384–89. http://dx.doi.org/10.1609/aaai.v25i1.7799.
Abstract:
In order to better protect and conserve biodiversity, ecologists use machine learning and statistics to understand how species respond to their environment and to predict how they will respond to future climate change, habitat loss and other threats. A fundamental modeling task is to estimate the probability that a given species is present in (or uses) a site, conditional on environmental variables such as precipitation and temperature. For a limited number of species, survey data consisting of both presence and absence records are available, and can be used to fit a variety of conventional classification and regression models. For most species, however, the available data consist only of occurrence records --- locations where the species has been observed. In two closely-related but separate bodies of ecological literature, diverse special-purpose models have been developed that contrast occurrence data with a random sample of available environmental conditions. The most widespread statistical approaches involve either fitting an exponential model of species' conditional probability of presence, or fitting a naive logistic model in which the random sample of available conditions is treated as absence data; both approaches have well-known drawbacks, and do not necessarily produce valid probabilities. After summarizing existing methods, we overcome their drawbacks by introducing a new scaled binomial loss function for estimating an underlying logistic model of species presence/absence. Like the Expectation-Maximization approach of Ward et al. and the method of Steinberg and Cardell, our approach requires an estimate of population prevalence, $\Pr(y=1)$, since prevalence is not identifiable from occurrence data alone. In contrast to the latter two methods, our loss function is straightforward to integrate into a variety of existing modeling frameworks such as generalized linear and additive models and boosted regression trees. We also demonstrate that approaches by Lele and Keim and by Lancaster and Imbens that surmount the identifiability issue by making parametric data assumptions do not typically produce valid probability estimates.
Dissertations / Theses on the topic "Steinberg variety":
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Jacques, Simon. "Adhérences de certaines orbites dans la variété de drapeaux, résolution et normalité dans les types classiques A, B, D." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0299.
Abstract:
Soit G un groupe algébrique en type classique A, B ou D. Soit e un élément nilpotent de son algèbre de Lie et Z son centralisateur. On suppose la caractéristique nulle et l'ordre de e, vu comme endomorphisme, égal à deux. Cette thèse établit les propriétés de normalité, rationalité et Cohen-Macaulay pour toute adhérence Y d'une Z-orbite dans la variété des drapeaux de G. Elle étend ainsi un résultat de N.Perrin et E.Smirnov qui traitant le cas où Y est une composante irréductible d'une fibre de Springer pour les types A et D. Nous employons le même argument principal, à savoir un raisonnement récursif basé sur (1) la birationnalité d'un morphisme vers Y et (2) la surjectivité d'une restriction de sections. Pour produire (1), nous faisons intervenir les variétés de Schubert, de Bott-Samelson et employons la théorie des sous-groupes symétriques en recourant à des références classiques sur le sujet (R-W Richardson, T-A Springer). Pour (2), nous nous basons sur un théorème de X.He et J-F Thomsen fournissant un scindage de Frobenius. Celui-ci implique alors (2) en caractéristique positive et nous opérons une réduction p pour nous ramener à la caractéristique nulle de départ. Notre travail appelle à se prolonger dans différentes pistes de réflexion et de recherche. Il pourrait avoir des implications positives pour l'étude des composantes irréductibles de la variété de Steinberg, et à travers elles, du calcul de polynômes caractéristiques introduits par A.Joseph afin de constituer des représentations irréductibles du groupe de Weyl. Notre travail pose aussi la question naturelle de la généralisation de son résultat au type C, aux types exceptionnels et à la caractéristique positiveLet G be a connected algebraic reductive group in types A, B, or D, and e be a nilpotent element of its Lie algebra with centralizer Z:=Z_G(e). We suppose the characteristic zero and that e corresponds to a nilpotent endomorphism of order two. We sketch a proof of the following result: all Z-orbit closures Y in the flag variety X of G are normal. It extends a work of Nicolas Perrin and Evgeny Smirnov which deals with an irreducible component Y of the Springer fiber X(e) in types A and D. We use the same main arguments, namely an induction based on (1): the existence of a suitable birational morphism onto Y, and (2): the surjectivity of section restrictions of an ample line bundle. For us (1) will be obtained thanks to good Weyl group elements, Schubert varieties, Bott-Samelson varieties and several fundamental results from Roger Wolcott Richardson and Tonny Albert Springer on symmetric spaces. On the other hand, (2) follows from a theorem proved by Xuhua He and Jesper Funch Thomsen which states Frobenius splittings of Y-like varieties. It thus implies (2) in positive characteristic and we just have to pass it through the zero : we then merely produce an example of the reduction modulo p method.Our work suggests several avenues of research and could be improved in several directions. It could have implications for the study of the irreducible components of the Steinberg variety and thus for the calculation of the characteristic polynomials. They have been introduced by Anthony Joseph in order to constitute irreducible representations of the Weyl group. Our work also raises the question of its generalization to the C type, the exceptional types and the positive characteristic
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Banafsheh, Farang-Hariri. "La correspondance de Howe géométrique modérément ramifiée pour les paires duales de type II dans le cadre du programme de Langlands géométrique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00743280.
Abstract:
Dans cette thèse on s'intéresse à la correspondance de Howe géométrique pour les paires duales réductives de type II (G = GL_n, H = GL_m) sur un corps local non-Archimédien F de caractéristique différente de 2, ainsi qu'à la fonctorialité de Langlands géométrique au niveau Iwahori. Notons S la représentation de Weil de G(F) × H(F) et I_H, I_G des sous groupes d'Iwahori de H(F) et G(F). On considère la version géométrique de la représentation S^(I_G×I_H) des algèbres de Hecke-Iwahori H_H et H_G sur laquelle agissent les foncteurs de Hecke. On obtient des résultats partiels sur la description géométrique de la catégorie correspondante. Nous proposons une conjecture décrivant le groupe de Grothendieck de cette catégorie comme module sur les algèbres de Hecke affines étendues de G et de H. Notre description est en termes d'un champ attaché aux groupes de Langlands duaux dans le style de l'isomorphisme de Kazhdan-Lusztig. On démontre cette conjecture pour toutes les paires (GL_1, GL_m). Plus généralement, étant donné deux groupes réductifs connexes G et H et un morphisme \check{G}× SL_2 \to \check{H} de groupes de Langlands duaux, on suggère un bimodule sur les algèbres de Hecke affines étendues de G et de H qui pourrait conjecturalement réaliser la fonctorialité de Langlands géométrique locale au niveau Iwahori.
Books on the topic "Steinberg variety":
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Steinberg, John W. The Military History of the Russian Empire from Peter the Great until Nicholas II. Bloomsbury Publishing Plc, 2024. http://dx.doi.org/10.5040/9781350037212.
Abstract:
This book examines the rise and the fall of the Russian Empire through the lens of its military history. While much of the literature on this history tends to focus on epochs, The Russian Military and the Creation of Empire uses a variety of archival sources to capture this aspect of modern Russia from Peter the Great right up to the present day. John W. Steinberg analyzes the social dynamic between Russian society and its military over time. Through a focus on civil-military relations, he demonstrates that both the Tsarist and Soviet regimes were built on, and ultimately dependent upon, the support of the military. Case studies of significant battles are also used throughout the volume to reveal insights into the roles, missions, and capabilities of the Russian military since 1689. The Russian Military and the Creation of Empire is a vital study for all students of modern Russia and the history of modern warfare.
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Johnson, Claudia Durst. Understanding Of Mice and Men, The Red Pony and The Pearl. Greenwood, 1997. http://dx.doi.org/10.5040/9798216029656.
Abstract:
Although John Steinbeck's novellasOf Mice and Men,The Red Pony, andThe Pearlare works of fiction, they provide a window on the history of the times and places they portray. Studying the historical, social, economic, and regional background of each novella is important to fully understanding each work. This interdisciplinary collection of rich collateral materials features a variety of primary documents that shed light on the background of each of these novellas—the pioneer days and life on the Western frontier, the early history of California, the gold rush, the plight of the migrant worker during the Great Depression, the problems of the homeless and the hopeless, and oppression in Mexico in the early 20th century. Documents include memoirs of mountain men and pioneers, books of travel, sociological studies, a political treatise, a journal, reports of U.S. commissions, a comic memoir, and an interview with a Salvation Army general who worked with the downtrodden during the 1930s. Most of these materials are not available in printed form anywhere else. The purpose of this volume is to explore through analysis and collateral readings the pervasive theme in these novellas: the universality of humankind's often futile struggle for a better existence. Steinbeck shows that the American vision is shaped by the dream of a better life represented in the myth of the West. A social and political commentator, he dramatizes in all three novellas the social issues of the time. The first chapter of this study, a literary analysis, examines key themes common to all three novellas. The remaining chapters place the works in historical context. Old California and the West includes accounts of 18th- and 19th-century travelers to California who dreamed of a better life. Land Ownership examines the meaning of land ownership in the West and its corruption. The Vagrant Farm Worker: Homeless in Paradise features memoirs and journals of itinerant workers as well as Mark Twain'sRoughing Itand a study of the hobo. Losers of the American Dream deals with the homeless and hopeless during the early years of this century and the Great Depression. The American Dream in a Mexican Setting illuminates the lives of the oppressed in Mexico which provoked a century of revolutions. Each chapter concludes with study questions, ideas for class discussion and student projects and papers, and a list of books for further reading. This is an ideal companion for teacher use and student research in English and American history classes.
Book chapters on the topic "Steinberg variety":
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Campo, M. Saveria. "Towards vaccines against papillomavirus." In Human Papillornaviruses and Cervical Cancer, 177–91. Oxford University PressOxford, 1994. http://dx.doi.org/10.1093/oso/9780198547969.003.0010.
Abstract:
Abstract As already described elsewhere (Chapter 2), papillomaviruses induce a variety of lesions both in humans and in animals. Some papillomas, albeit benign, are themselves a clinical problem, such as laryngeal papillomas of children (Steinberg 1987) or penile papillomas of bulls (Jarrett 1985), and others are known to be a risk factor in the pathogenesis of cancer. In humans, papillomavirus infection of the genital tract can lead to squamous cell carcinoma particularly in the uterine cervix (zur Hausen 1991), and infection of the skin by certain virus types can develop into squamous cancer in immunosuppressed individuals (Orth 1987). In animals, the link between papillomavirus and cancer of the skin in rabbits, and of the urinary bladder and the upper alimentary canal in cattle, is well documented (Kreider 1980; Campo and Jarrett 1986; Campo et al. 1992).
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Steinberg, Martin. "Alzheimer’s Disease." In Psychiatric Aspects of Neurologic Diseases. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780195309430.003.0016.
Abstract:
Alzheimer’s disease (AD), a progressive degenerative dementia, causes suffering for millions of patients as well as their caregivers. Among the elderly, the prevalence of AD increases dramatically with age: it is about 5% to 7% in people 65 years of age and older and rises to 40% to 50% in those older than 90 years of age (Rabins, Lyketsos, and Steele, 1999). AD typically affects short-term memory first; over time, impairment in language, praxis, recognition, and executive function occur. In the late stages, patients become completely dependent on others. In addition to this cognitive and physical burden, psychiatric signs and symptoms are nearly universal. These psychiatric phenomena, which include depression, delusions, hallucinations, apathy, and aggression, affect as many as 90% of patients with dementia over the course of their illness (Steinberg et al., 2003). Psychiatric phenomena often present differently in patients with AD than in the population without dementia. Uncertainty remains regarding how to best classify many of these phenomena. For example, delusions can be described as occurring in isolation, or as part of a psychotic syndrome, with associated features such as irritability and agitation. Delusions can also occur as part of a depressive syndrome or delirium. Little research is currently available to guide treatment. Nevertheless, many syndromes can be accurately diagnosed and can respond to a variety of pharmacologic and nonpharmacologic treatments. Depressive phenomena are common in AD. Estimates for the prevalence of major depression in patients with AD are 20% to 25%, (Lyketsos et al., 2003). Due to their dementia, patients with AD are often poor historians. They may not be aware of Depressive phenomena or able to recall them, and their aphasia may make describing symptoms difficult. Therefore, information from a reliable caregiver is crucial for making a proper diagnosis. Depressive disorders in AD are often somewhat different from those occurring in the absence of dementia. In particular, patients with AD may not endorse hopelessness, suicidal thoughts, or worthlessness (Zubenko et al., 2003). Patients with AD, however, express symptoms such as anxiety, anhedonia, irritability, lack of motivation, and agitation (Rosenberg et al., 2005).
Conference papers on the topic "Steinberg variety":
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Doney, Robert L., John H. J. Niederhaus, Timothy J. Fuller, and Matthew J. Coppinger. "Effects of EOS and constitutive models on simulating copper shaped charge jets in ALEGRA." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-010.
Abstract:
Abstract Metallic shaped charge jets (SCJ) have been studied for many decades across multiple communities for applications ranging from military warheads to earth penetrators for accessing oil-rich areas [1]. Researchers have had varied success in modeling these jets using simulation codes such as CTH, ALEGRA, and ALE3D. Recently, a large amount of work has been performed at the US Army Research Lab investigating the behavior of jets with increasingly sophisticated experimental diagnostics. Advances in computational resources, code enhancements, and material models have allowed us to model jets and probe uncertainties caused by algorithms, equations of state (EOS), constitutive models, and any of the available parameters each one provides. In this work we explore the effects that various EOS and constitutive models have on the development and characteristics of a 65-mm diameter, 2D copper SCJ using the Sandia National Laboratories’ multiphysics hydrocode, ALEGRA [2]. Specifically, we evaluate the tabular SESAME 3320 [3], 3325 [4-5], and 3337 [6] EOS models, analytic EOS (ANEOS) 3331 [7], as well as the Johnson-Cook (JC) [8], Zerilli-Armstrong (ZA) [9], Preston-Tonks-Wallace (PTW) [10], Steinberg-Guinan-Lund (SGL) [11-12], and Mechanical Threshold Stress (MTS) [13] constitutive models. Note that while the SGL model supports rate-dependence, there is no current characterization for copper, thus we are using rate-independent version. We do not consider the MieGrüneisen equation of state here as we expect parts of the jet to be near or cross into melt.