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For cohomology theories closely related to Morava E-theory, we provide an algebro-geometric interpretation of the cohomology of groups that arise as centralizers of tuples of commuting elements inside of symmetric groups. The interpretation…

Algebraic Topology · Mathematics 2013-05-29 Nathaniel Stapleton

We give a new proof of a Theorem of Vogan which classify the cohomological representations of a real semisimple Lie group $G$ which are isolated in the unitary dual of $G$. We investigate the same question in the automorphic dual, and…

Representation Theory · Mathematics 2007-05-23 N. Bergeron

This paper classifies the equivalence classes of irreducible unitary representations with nonvanishing Dirac cohomology for complex $E_6$. This is achieved by using our finiteness result, and by improving the computing method.

Representation Theory · Mathematics 2018-12-27 Chao-Ping Dong

This paper is devoted to the horizontal (``characteristic'') cohomology of systems of differential equations. Recent results on computing the horizontal cohomology via the compatibility complex are generalized. New results on the Vinogradov…

Differential Geometry · Mathematics 2007-05-23 Alexander Verbovetsky

We develop a cohomology theory of groups based on partial actions and explore its relation with the partial Schur multiplier as well as with cohomology of inverse semigroups.

Group Theory · Mathematics 2018-02-02 M. Dokuchaev , M. Khrypchenko

This article is a survey of 0-cohomology of semigroups. The main attention is devoted to applications.

Rings and Algebras · Mathematics 2008-03-10 B. V. Novikov

This paper describes an approach to computer aided calculations in the cohomology of arithmetic groups. It complements existing literature on the topic by emphasizing homotopies and perturbation techniques, rather than cellular subdivision,…

Number Theory · Mathematics 2025-08-26 Graham Ellis

We give an overview of differential cohomology from the point of view of algebraic topology. This includes a survey of several different definitions of differential cohomology groups, a discussion of differential characteristic classes, an…

Algebraic Topology · Mathematics 2024-11-15 Arun Debray

This is a report on the present state of the problem of determining the dimension of the Nichols algebra associated to a rack and a cocycle. This is relevant for the classification of finite-dimensional complex pointed Hopf algebras whose…

Quantum Algebra · Mathematics 2011-03-22 N. Andruskiewitsch , F. Fantino , G. A. Garcia , L. Vendramin

In a previous paper, the author compute the dimension of Hochschild cohomology groups of Jacobian algebras from (unpunctured) triangulated surfaces, and gave a geometric interpretation of those numbers in terms of the number of internal…

Representation Theory · Mathematics 2016-10-12 Yadira Valdivieso-Díaz

Representations of Hom-Jacobi-Jordan algebras are studied. In particular, adjoint representations and trivial representations are studied in detail. Derivations and central extensions of Hom-Jacobi-Jordan algebras are also discussed as an…

Rings and Algebras · Mathematics 2023-08-09 Jules Anitheou , Sylvain Attan , Kinvi Kangni

In this article we introduce the space of configurations of commuting elements in a topological group and show that it satisfies rational homological stability for the sequences of unitary, special unitary and symplectic groups. We also…

Algebraic Topology · Mathematics 2022-01-11 José Cantarero , Ángel R. Jiménez

The study of triangulations on manifolds is closely related to understanding the three-dimensional homology cobordism group. We review here what is known about this group, with an emphasis on the local equivalence methods coming from…

Geometric Topology · Mathematics 2018-08-15 Ciprian Manolescu

We calculate the cohomology rings of a collection of seven dimensional manifolds supporting an S^3 x S^3-action with one dimensional orbit space. These manifolds are of interest to differential geometers studying non-negative and positive…

Differential Geometry · Mathematics 2008-12-08 Christine M. Escher , S. K. Ultman

We study countable embedding-universal and homomorphism-universal structures and unify results related to both of these notions. We show that many universal and ultrahomogeneous structures allow a concise description (called here a finite…

Combinatorics · Mathematics 2010-09-06 Jan Hubicka

The article is devoted to homological complexes. Smashly graded modules and complexes are studied over nonassociative algebras with metagroup relations. Smashed tensor products of homological complexes are investigated. Their homotopisms…

Rings and Algebras · Mathematics 2020-12-21 S. V. Ludkowski

We generalize a result, on the pro-representability of Milnor $K$-cohomology groups at the identity, that's due to Bloch. In particular, we prove, for $X$ a smooth, proper, and geometrically connected variety defined over an algebraic field…

Algebraic Geometry · Mathematics 2023-01-23 Eoin Mackall

In this article, we computed the homology groups of real Grassmann manifold $G_{n,m}(\mathbb{R})$ by Witten complex.

Differential Geometry · Mathematics 2017-04-11 Xu Chen

Topological Data Analysis (TDA) is a novel statistical technique, particularly powerful for the analysis of large and high dimensional data sets. Much of TDA is based on the tool of persistent homology, represented visually via persistence…

Applications · Statistics 2017-11-07 Sarit Agami , Robert J. Adler

There are different notions of homology and cohomology that can be defined for a group with an action of another group by group automorphisms. In this paper we address three natural questions that arise in this context. Namely, the relation…

K-Theory and Homology · Mathematics 2020-07-14 Carlos Aquino , Rolando Jimenez , Martin Mijangos , Quitzeh Morales Meléndez