Efficient computations in central simple algebras using Amitsur cohomology

P Kutas, M Montessinos - Journal of Algebra, 2025 - Elsevier
We introduce a presentation for central simple algebras over a field k using Amitsur
cohomology. We provide efficient algorithms for computing a cocycle corresponding to any …

A polynomial quantum algorithm for the explicit isomorphism problem

P Kutas, M Montessinos - arXiv preprint arXiv:2307.00261, 2023 - arxiv.org
We present an efficient computational representation of central simple algebras using
Brauer factor sets. Using this representation and polynomial quantum algorithms for number …

Linear complementary pairs of skew constacyclic codes

FJ Lobillo, JM Muñoz - arXiv preprint arXiv:2312.07183, 2023 - arxiv.org
Linear complementary pairs (LCPs) of codes have been studied since they were introduced
in the context of discussing mitigation measures against possible hardware attacks to …

Explicit isomorphisms of quaternion algebras over quadratic global fields

T Csahók, P Kutas, M Montessinos… - Research in Number …, 2022 - Springer
Let L be a separable quadratic extension of either Q \documentclass[12pt]{minimal} \usepackage{amsmath}
\usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} …

Idempotents of 2× 2 matrix rings over rings of formal power series

V Drensky - Linear and Multilinear Algebra, 2022 - Taylor & Francis
ABSTRACT Let A 1,…, A s be unitary commutative rings which do not have non-trivial
idempotents and let A= A 1⊕⋯⊕ A s be their direct sum. We describe all idempotents in the …

The eigenspaces of twisted polynomials over cyclic field extensions

A Owen, S Pumpluen - arXiv preprint arXiv:1909.07728, 2019 - arxiv.org
Let $ K $ be a field and $\sigma $ an automorphism of $ K $ of order $ n $. Employing a
nonassociative algebra, we study the eigenspace of a bounded skew polynomial $ f\in K …

Idempotents of matrix rings over rings of formal power series

V Drensky - arXiv preprint arXiv:2006.15070, 2020 - arxiv.org
Let $ A_1,\ldots, A_s $ be unitary commutative rings which do not have non-trivial
idempotents and let $ A= A_1\oplus\cdots\oplus A_s $ be their direct sum. We describe all …

The eigenspaces of twisted polynomials over cyclic field extensions

A Owen, S Pumplün - Analele ştiinţifice ale Universităţii" Ovidius" …, 2023 - sciendo.com
Let K be a field and σ an automorphism of K of order n. Employing a nonassociative algebra,
we study the eigenspace of a bounded skew polynomial f∈ K [t; σ]. We mainly treat the case …