Stability for socle-projective categories of type $\mathbb{A}$

TL;DR

This paper extends the concept of stability to socle-projective representations of type A posets, demonstrating that all indecomposables are stable through algebraic and geometric methods, and linking these perspectives.

Contribution

It introduces a new stability notion for socle-projective representations of type A posets and provides dual proofs and a geometric realization connecting algebraic and geometric approaches.

Findings

All indecomposable peak P-spaces are stable.

A bilinear form approach confirms stability.

A geometric model ensures stability of indecomposables.

Abstract

We extend the notion of stability in the non-abelian category of poset representations (introduced by Futorny and Iusenko) to the category of socle-projective representations of a given $r$-peak poset $\P$. When $\P$ is a poset of type $\mathbb{A}$, we demonstrate in two distinct ways that every indecomposable peak $\P$-space is stable. First, this is shown using a bilinear form associated with the poset. Second, we prove it by observing that a stability function derived from a geometric model ensures that all indecomposable objects are stable. Along the way, we provide a new geometric realization of the category of socle-projective representations, inspired by the work of Schiffler and Serna [\textit{J. Pure Appl. Algebra} \textbf{224} (2020), no.~12, 106436, 23 pp.; MR4101480]. Finally, we establish a connection between the geometric perspective and the bilinear form approach.