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We show that the reduction mod p of an orthogonal linear representation is orthogonal, and we generalize this fact to representations of algebras with involution.The proofs make an essential use of the notion of " middle lattices ".

Group Theory · Mathematics 2018-08-09 Jean-Pierre Serre

This paper aims at the following results: \begin{enumerate} \item The class of all $*$-regular rings forms a variety. \item A subdirectly irreducible $*$-regular ring $R$ is faithfully representable (i.e. isomorphic to a subring of an…

Rings and Algebras · Mathematics 2018-11-06 Christian Herrmann , Niklas Niemann

In this paper we have discussed different possible orthogonalities in matrices, namely orthogonal, quasi-orthogonal, semi-orthogonal and non-orthogonal matrices including completely positive matrices, while giving some of their…

Discrete Mathematics · Computer Science 2007-05-23 R. N. Mohan

In the present article a new method of deriving integral representations of combinations and partitions in terms of harmonic products has been established. This method may be relevant to statistical mechanics and to number theory.

Mathematical Physics · Physics 2011-03-02 Michalis Psimopoulos

Our approach establishes a natural correspondence between complete orthomodular lattices and certain types of quantales. Firstly, given a complete orthomodular lattice X, we associate with it a Foulis quantale Lin(X) consisting of its…

Logic · Mathematics 2025-02-11 Michal Botur , Jan Paseka , Richard Smolka

We study the higher-order Euler polynomials and give the corresponding monic orthogonal polynomials, which are Meixner-Pollaczek polynomials with certain arguments and constant factors. Moreover, through a general connection between moments…

Combinatorics · Mathematics 2018-08-14 Lin Jiu , Diane Yahui Shi

The article covers developments in the representation theory of finite group schemes over the last fifteen years. We start with the finite generation of cohomology of a finite group scheme and proceed to discuss various consequences and…

Representation Theory · Mathematics 2014-09-25 Julia Pevtsova

We examine the lattice generated by two pairs of supplementary vector subspaces of a finite-dimensional vector space by intersection and sum, with the aim of applying the results to the study of representations admitting two pairs of…

Representation Theory · Mathematics 2008-02-21 Lionel Bérard Bergery , Thomas Krantz

Matrix-valued holomorphic quantum modular forms are intricate objects that arise in successive refinements of the Volume Conjecture of knots and involve three holomorphic, asymptotic and arithmetic objects. It is expected that the algebraic…

Geometric Topology · Mathematics 2024-07-15 Ni An , Stavros Garoufalidis , Shana Yunsheng Li

In this paper we consider certain quaternary quadratic forms and octonary quadratic forms and by using the theory of modular forms, we find formulae for the number of representations of a positive integer by these quadratic forms.

Number Theory · Mathematics 2017-08-16 B. Ramakrishnan , Brundaban Sahu , Anup Kumar Singh

We generalize the notion of length to an ordinal-valued invariant defined on the class of finitely generated modules over a Noetherian ring. A key property of this invariant is its semi-additivity on short exact sequences. We show how to…

Commutative Algebra · Mathematics 2013-09-27 Hans Schoutens

A general theory of vector-valued modular functions, holomorphic in the upper half-plane, is presented for finite dimensional representations of the modular group. This also provides a description of vector-valued modular forms of arbitrary…

Number Theory · Mathematics 2007-05-23 P. Bantay , T. Gannon

In this paper, we explore when a locally finite triangulated category has dimension zero or finite representation type. We also study generation of derived categories by orthogonal subcategories.

Representation Theory · Mathematics 2018-01-30 Takuma Aihara , Ryo Takahashi

Moduli spaces of complete collineations are wonderful compactifications of spaces of linear maps of maximal rank between two fixed vector spaces. We investigate the birational geometry of moduli spaces of complete collineations and quadrics…

Algebraic Geometry · Mathematics 2020-08-26 Alex Massarenti

We introduce and study blob and framed blob monoids. In particular, several realizations of these monoids are given. We compute the cardinality of the framed blob monoid and derive some combinatorial formulas involving this cardinality.

Combinatorics · Mathematics 2025-01-27 Jesús Juyumaya , Diego Lobos

We develop a framework to construct geometric representations of finite groups $G$ through the correspondence between real toric spaces $X^{\mathbb R}$ and simplicial complexes with characteristic matrices. We give a combinatorial…

Algebraic Topology · Mathematics 2019-03-21 Soojin Cho , Suyoung Choi , Shizuo Kaji

In this paper, we first study the Gorenstein projective/flat dimension of complexes of modules. The relation between the Gorenstein projective/flat dimension for complexes and that for modules are investigated. Then we study Tate, stable…

Rings and Algebras · Mathematics 2020-09-18 Li Liang

A class of ordered relational topological spaces is described, which we call orthomodular spaces. Our construction of these spaces involves adding a topology to the class of orthomodular frames introduced by Hartonas, along the lines of…

Logic · Mathematics 2023-04-26 Joseph McDonald , Katalin Bimbó

This is a survey paper dealing with moduli aspects of curves over finite fields. It discusses counting points of moduli spaces, relations with modular forms and stratifications on moduli spaces.

Algebraic Geometry · Mathematics 2022-10-27 Gerard van der Geer

This paper investigates the intersection of residuated structures from many-valued logic and orthomodular lattices from quantum logic. We explore whether non-Boolean structures can simultaneously satisfy residuation principles and…

Logic · Mathematics 2026-02-26 Michal Botur , David Kruml , Jan Paseka