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We derive a formula connecting the orders of the automorphism groups of a finite group and of its covering groups.

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Some question about representations of $p$-adic groups are discussed.

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In this paper, we study the isotropy subgroups of some almost rigid domains and give necessary and sufficient conditions for an automorphism to be in the isotropy subgroup.

Commutative Algebra · Mathematics 2022-02-22 Nikhilesh Dasgupta , Animesh Lahiri

We present groupoid morphisms as an algebraic structure for nonautonomous dynamics, as well as a generalization of group morphisms, which describe classic dynamical systems. We introduce the structure of cotranslations, as a specific kind…

Dynamical Systems · Mathematics 2023-11-14 Néstor Jara

This paper studies unitary representations with Dirac cohomology for complex groups, in particular relations to unipotent representations

Representation Theory · Mathematics 2010-07-09 Dan Barbasch , Pavle Pandžić

We construct a model for the space of automorphisms of a connected p-compact group in terms of the space of automorphisms of its maximal torus normalizer and its root datum. As a consequence we show that any homomorphism to the outer…

Algebraic Topology · Mathematics 2014-11-11 Kasper K. S. Andersen , Jesper Grodal

We prove that numerous negatively curved simply connected locally compact polyhedral complexes, admitting a discrete cocompact group of automorphisms, have automorphism groups which are locally compact, uncountable, non linear and virtually…

Group Theory · Mathematics 2016-09-07 Frederic Haglund , Frederic Paulin

We combine classic stability results for foliations with recent results on deformations of Lie groupoids and Lie algebroids to provide a cohomological characterization for rigidity of compact foliations on compact manifolds.

Differential Geometry · Mathematics 2019-07-31 Matias del Hoyo , Rui Loja Fernandes

We describe the automorphism groups of reductive monoids and of root monoids with active groups of invertible elements.

Algebraic Geometry · Mathematics 2026-05-13 Anton Shafarevich

In the article, we exhibit a series of new examples of rigid plane curves, that is, curves, whose collection of singularities determines them almost uniquely up to a projective transformation of the plane.

Algebraic Geometry · Mathematics 2015-06-29 Viktor S. Kulikov , Eugenii Shustin

In this paper, we introduce the concept of stable automorphic forms for semisimple algebraic groups and use the stability of automorphic forms to study the geometry of infinite dimensional arithmetic quotients.

Algebraic Geometry · Mathematics 2025-09-15 Jae-Hyun Yang

A conjecture of Berkovich asserts that every non-simple finite p-group has a non-inner automorphism of order p. This conjecture is far from being proved despite the great effort devoted to it. In this paper we prove it for p-groups of…

Group Theory · Mathematics 2013-01-03 Yassine Guerboussa , Miloud Reguiat

We establish Bochner-type formulas for operators related to $CR$ automorphisms and spherical $CR$ structures. From such formulas, we draw conclusions about rigidity by making assumptions on the Tanaka-Webster curvature and torsion.

Differential Geometry · Mathematics 2007-05-23 Jih-Hsin Cheng

We classify all group topologies coarser than the topology of stabilizers of finite sets in the case of automorphism groups of countable free-homogeneous structures, Urysohn space and Urysohn sphere, among other related results.

Logic · Mathematics 2024-02-21 Zaniar Ghadernezhad , Javier de la Nuez González

We prove p-adic functoriality for inner forms of unitary groups in three variables by establishing the existence of morphisms between eigenvarieties that extend the classical Langlands functoriality.

Number Theory · Mathematics 2014-09-24 Judith Ludwig

We prove an automatic convergence theorem for holomorphic modular forms on tube domains. The argument works in some generality, and covers in particular the case of orthogonal groups, symplectic groups, unitary and quaternion unitary…

Number Theory · Mathematics 2026-03-03 Aaron Pollack

We study groups of homeomorphic bijections on spaces that are finite unions of compact connected linearly ordered subsets. We prove that all such groups when endowed with the topology of point-wise convergence are topological groups. }

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We establish rigidity (or uniqueness) theorems for nc automorphisms which are natural extensions of clasical results of H.~Cartan and are improvements of recent results. We apply our results to nc-domains consisting of unit balls of…

Operator Algebras · Mathematics 2015-02-27 John E. McCarthy , Richard M. Timoney

We construct examples of robustly transitive and stably ergodic partially hyperbolic diffeomorphisms $f$ on compact $3$-manifolds with fundamental groups of exponential growth such that $f^n$ is not homotopic to identity for all $n>0$.…

Dynamical Systems · Mathematics 2016-12-21 Christian Bonatti , Andrey Gogolev , Rafael Potrie

In this paper we use formal group rings to construct an algebraic model of the $T$-equivariant oriented cohomology of smooth toric varieties. Then we compare our model with known results of equivariant cohomology of toric varieties to…

Algebraic Geometry · Mathematics 2015-03-27 Wanshun Wong