Central quasi-morphicity, central morphicity, and strongly $π$-regularity

Theophilus Gera; Amit Sharma

Home/Archive/arXiv

arXiv · 2511.10569

Central quasi-morphicity, central morphicity, and strongly $π$-regularity

Theophilus Gera·Amit Sharma

View original source ↗Read source document ↗Export metadata ↓

Abstract

This paper revisits the notions of centrally morphic and centrally quasi-morphic modules introduced by Dehghani and Sedaghatjoo. We identify sufficient conditions under which these notions become equivalent. In particular, if a module $ M $ is image-projective, generates its kernels, and its endomorphism ring has von Neumann regular center, then central morphicity, central quasi-morphicity, and right central morphicity of the endomorphism ring are equivalent. We also prove that centrally morphic rings with von Neumann regular center and ACC on principal right annihilators are strongly $π$-regular.

Explore related subjects

math.RA

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

Theophilus Gera, Amit Sharma. 2026-09-17. Central quasi-morphicity, central morphicity, and strongly $π$-regularity. https://arxiv.org/abs/2511.10569

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

On solutions of singular Sylvester equations in quaternions

The quaternionic equations ax-xb=0 and ax-xb=c are investigated, which are called homogeneous and inhomogeneous Sylvester equations, respectively. Conditions for the existence of solutions are provided. In addition, the general and nonzero solutions to these equations are derived applying quaternion square roots.

math.RA↗

arXiv2026

Positivity preservers over finite fields II

We say that a matrix over a finite field $\mathbb{F}_q$ is positive definite if it is symmetric and each of its leading principal minors is a nonzero square in $\mathbb{F}_q$. In previous work of the authors [J. Algebra, 2025], the entrywise positivity preservers on $M_n(\mathbb{F}_q)$ were classified in every case except when $n=2$, $q\equiv1\pmod4$, and $q$ is not a square. We settle this remaining case, thereby completing the classification of entrywise positivity preservers over every finite field and in every dimension $n\ge2$. Our proof is based on a novel idempotent reduction that not only resolves the remaining case but also yields a self-contained proof of the complete classification, while avoiding several technical results used in the earlier arguments. As a further application of the same reduction, we classify the entrywise preservers of strongly nonsingular matrices, i.e., matrices whose leading principal minors are all nonzero. We also prove a more general theorem in odd characteristic: for every prescribed sign pattern of nonzero leading principal minors of matrices of a fixed dimension $n\ge2$, the entrywise preservers are precisely the positive scalar multiples of field automorphisms. Thus, in odd characteristic, preserving any nonzero leading-principal-minor sign pattern surprisingly forces the preservation of every such sign pattern.

math.RA↗

arXiv2026

Graphs of Moore-Penrose inverse of matrices possessing the treeangle property

It is known that the inverse of an invertible real square matrix satisfying the treeangle property, is a treediagonal matrix. A converse statement also holds. We show that the verbatim analogues are not true for the Moore-Penrose inverse, and obtain the precise structure of graphs corresponding to the Moore-Penrose inverse of matrices possessing the treeangle property.

math.RA↗