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We show that the deletion theorem of a free arrangement is combinatorial, i.e., whether we can delete a hyperplane from a free arrangement keeping freeness depends only on the intersection lattice. In fact, we give an explicit sufficient…

Combinatorics · Mathematics 2017-09-26 Takuro Abe

We study a natural analogue of Collatz's Conjecture for polynomials over $\mathbb{F}_2$.

Number Theory · Mathematics 2025-10-10 Luis H. Gallardo , Olivier Rahavandrainy

Over a field of characteristic zero, we prove that the Freiheitssatz holds for brace algebras, the word problem for the brace algebras with a single defining relation is decidable, two generated subalgebras of free brace algebras are free,…

Rings and Algebras · Mathematics 2018-10-02 Yu Li , Qiuhui Mo , Xiangui Zhao

We provide a new condition for an absolutely almost simple algebraic group to have good reduction with respect to a discrete valuation of the base field which is formulated in terms of the existence of maximal tori with special properties.…

Number Theory · Mathematics 2023-12-15 Vladimir I. Chernousov , Andrei S. Rapinchuk , Igor A. Rapinchuk

This paper addresses the classification problem of associative algebras over arbitrary base fields. We present a list of three-dimensional associative algebras with canonical representatives of the isomorphism classes for fields of…

Rings and Algebras · Mathematics 2026-03-09 U. Bekbaev , I. Rakhimov

We investigate atomicity of free algebras and various forms of amalgamation for BL and MV algebras, and also Heyting algebras, though the latter algebras may not be linearly ordered, so strictly speaking their corresponding intuitionistic…

Logic · Mathematics 2013-04-05 Tarek Sayed Ahmed

The structure of nilpotent symplectic algebras of maximal class has been studied in [8, 5]. In this paper, we study the dual subclass of algebras of minimal class. In particular, we show that symplectic alternating algebras of dimension up…

Rings and Algebras · Mathematics 2024-07-04 Layla Sorkatti , Özlem Uğurlu , Manisha Varahagiri

Using an approach to the Jacobian Conjecture by L.M. Dru\.zkowski and K. Rusek 12], G. Gorni and G. Zampieri [19], and A.V. Yagzhev[27], we describe a correspondence between finite dimensional symmetric algebras and homogeneous tuples of…

Algebraic Geometry · Mathematics 2020-01-03 Ualbai Umirbaev

This is a survey and research note on the modified Orlik conjecture derived from the division theorem introduced in [2]. The division theorem is a generalization of classical addition-deletion theorems for free arrangements. The division…

Commutative Algebra · Mathematics 2016-03-15 Takuro Abe

We partially prove and partially disprove Oka's conjecture on the fundamental group/Alexander polynomial of an irreducible plane sextic. Among other results, we enumerate all irreducible sextics with simple singularities admitting dihedral…

Algebraic Geometry · Mathematics 2008-10-24 Alex Degtyarev

We prove an analogue of James-Donkin row removal theorems for arbitrary diagrammatic Cherednik algebras. This is one of the first results concerning the (graded) decomposition numbers of these algebras over fields of arbitrary…

Representation Theory · Mathematics 2019-11-20 Chris Bowman , Liron Speyer

In this paper we study double cosets of finite rank free groups. We focus our attention on cancellation types in double cosets and their formal language properties.

Group Theory · Mathematics 2013-09-17 Elizaveta Frenkel , Vladimir N. Remeslennikov

This article contains a complete proof of Gabrielov's rank Theorem, a fundamental result in the study of analytic map germs. Inspired by the works of Gabrielov and Tougeron, we develop formal-geometric techniques which clarify the difficult…

Complex Variables · Mathematics 2021-06-30 André Belotto da Silva , Octave Curmi , Guillaume Rond

A new simple way to prove the Frobenius conjecture on the dimensions of real algebras without zero divisors is given.

Algebraic Topology · Mathematics 2007-05-23 K. E. Feldman

We introduce a notion of real rank zero for inclusions of C$^*$-algebras. After showing that our definition has many equivalent characterisations, we offer a complete description of the commutative case. We provide permanence and…

Operator Algebras · Mathematics 2025-09-03 James Gabe , Robert Neagu

We discuss different generalizations of Zariski decomposition, relations between them and connections with finite generation of divisorial algebras.

Algebraic Geometry · Mathematics 2010-04-26 Yuri G. Prokhorov

The objective of this paper is to describe the structure of Zariski closed algebras, which provide a useful generalization to finite dimensional algebras in the study of representable algebras over finite fields. Our results include a…

Rings and Algebras · Mathematics 2011-09-23 Alexei Belov-Kanel , Louis H. Rowen , Uzi Vishne

We study the structure of the absolute differential Galois group of a rational function field over an algebraically closed field of characteristic zero. In particular, we relate the behavior of differential embedding problems to the…

Commutative Algebra · Mathematics 2022-03-22 Annette Bachmayr , David Harbater , Julia Hartmann , Michael Wibmer

A complete classifications, up to isomorphism, of two-dimensional associative and diassociative algebras over any basic field are given.

Rings and Algebras · Mathematics 2023-07-20 I. S. Rakhimov

We determine the abelianizations of the following three kinds of graded Lie algebras in certain stable ranges: derivations of the free associative algebra, derivations of the free Lie algebra and symplectic derivations of the free…

Algebraic Topology · Mathematics 2019-12-19 Shigeyuki Morita , Takuya Sakasai , Masaaki Suzuki