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We improve on the result of Hacon and Witaszek by showing that the MMP for semi-stable fourfolds in mixed characteristic terminates in several new situations. In particular, we show the validity of the MMP for strictly semi-stable fourfolds…

Algebraic Geometry · Mathematics 2022-06-23 Lingyao Xie , Qingyuan Xue

In this paper, we describe an algorithm for computing the left, right, or 2-sided congruences of a finitely presented semigroup or monoid with finitely many classes, and an alternative algorithm when the finitely presented semigroup or…

Rings and Algebras · Mathematics 2025-06-26 Marina Anagnostopoulou-Merkouri , Reinis Cirpons , James D. Mitchell , Maria Tsalakou

Bumagin-Wise posed the question of whether every countable group can be realised as the outer automorphism group of a finitely generated, residually finite group. We give a partial answer to this problem for recursively presentable groups.

Group Theory · Mathematics 2018-10-25 Alan D. Logan

We give a construction of a family of locally finite residually finite groups with just-infinite C*-algebra. This answers a question from [2]. Additionally, we show that residually finite groups of finite exponent are never just-infinite.

Operator Algebras · Mathematics 2016-06-27 V. Belyaev , R. Grigorchuk , P. Shumyatsky

This paper concerns partial groups, objective partial groups, and (finite) localities, with special attention given to the quotient of a locality by a partial normal subgroup.

Group Theory · Mathematics 2021-11-18 Andrew Chermak

The first goal of the present paper is to study residualities of the set of uniform $P$-ergodic Markov semigroups defined on abstract state spaces by means of a generalized Dobrushin ergodicity coefficient. In the last part of the paper, we…

Functional Analysis · Mathematics 2025-09-23 Nazife Erkurşun-Özcan , Farrukh Mukhamedov

We give parameterizations of the irreducible representations of finite groups of Lie type in their defining characteristic.

Representation Theory · Mathematics 2016-09-12 Olivier Brunat , Frank Lübeck

Let $A$ be an abelian variety defined over a field $K.$ We study finite generation properties of the profinite group $\mathrm{Gal}(\Omega/K)$ and of certain closed normal subgroups thereof, where $\Omega$ is the torsion field of $A$ over…

Number Theory · Mathematics 2024-07-02 Wojciech Gajda , Sebastian Petersen

We classify the irreducible representations of smooth, connected affine algebraic groups over a field, by tackling the case of pseudo-reductive groups. We reduce the problem of calculating the dimension for pseudo-split pseudo-reductive…

Representation Theory · Mathematics 2019-11-19 Michael Bate , David I. Stewart

A complete classification and character formulas for finite-dimensional irreducible representations of the rational Cherednik algebra of type A is given. Less complete results for other types are obtained. Links to the geometry of affine…

Representation Theory · Mathematics 2007-05-23 Yuri Berest , Pavel Etingof , Victor Ginzburg

We establish representation types (finite, tame or wild) of finite dimensional Munn algebras with semisimple bases. As an application, we establish representation types of finite 0-simple semigroups and their mutually annihilating unions.

Representation Theory · Mathematics 2022-08-22 Yuriy A. Drozd , Andriana I. Plakosh

Necessary and sufficient conditions for finite commutative semihypergroups to be built from abelian groups of the same order are established.

Representation Theory · Mathematics 2017-03-08 Stan Onypchuk

In this note some properties of the sum of element orders of a finite abelian group are studied.

Group Theory · Mathematics 2018-05-31 Marius Tărnăuceanu , Dan Gregorian Fodor

We classify finitely generated, residually finite automorphism-induced HNN-extensions in terms of the residual separability of a single associated subgroup. This classification provides a method to construct automorphism-induced…

Group Theory · Mathematics 2018-10-25 Alan D. Logan

In this paper, the complete algebraic structure of finite semisimple group algebra of a normally monomial group is described. The main result is illustrated by computing the explicit Wedderburn decomposition of finite semisimple group…

Rings and Algebras · Mathematics 2017-07-27 Shalini Gupta , Sugandha Maheshwary

We investigate classifications of quasitrivial semigroups defined by certain equivalence relations. The subclass of quasitrivial semigroups that preserve a given total ordering is also investigated. In the special case of finite semigroups,…

Rings and Algebras · Mathematics 2020-05-21 Jimmy Devillet , Jean-Luc Marichal , Bruno Teheux

We show that every virtually torsion-free subgroup of the outer automorphism group of a conjugacy separable relatively hyperbolic group is residually finite. As a direct consequence, we obtain that the outer automorphism group of a limit…

Group Theory · Mathematics 2009-07-29 V. Metaftsis , M. Sykiotis

Since for the classification of finite (congruence-)simple semirings it remains to classify the additively idempotent semirings, we progress on the characterization of finite simple additively idempotent semirings as semirings of…

Rings and Algebras · Mathematics 2013-01-01 Andreas Kendziorra , Jens Zumbrägel

In this note we describe the finite groups $G$ having $|G|-2$ cyclic subgroups. This partially solves the open problem in the end of \cite{3}.

Group Theory · Mathematics 2016-05-04 Marius Tărnăuceanu

We present an overview of the theory of finite groups, with regard to their application as flavour symmetries in particle physics. In a general part, we discuss useful theorems concerning group structure, conjugacy classes, representations…

High Energy Physics - Phenomenology · Physics 2017-06-08 Walter Grimus , Patrick Otto Ludl