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arXiv · 2405.20898

Codimensions of algebras with pseudoautomorphism and their exponential growth

Elena Campedel·Ginevra Giordani·Antonio Ioppolo
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Abstract

Let $F$ be a fixed field of characteristic zero containing an element $i$ such that $i^2 = -1$. In this paper we consider finite dimensional superalgebras over $F$ endowed with a pseudoautomorphism $p$ and we investigate the asymptotic behaviour of the corresponding sequence of $p$-codimensions $c_n^p(A),$ $n=1,2, \ldots$. First we give a positive answer to a conjecture of Amitsur in this setting: the $p$-exponent $\exp^p(A) = \lim_{n \rightarrow \infty} \sqrt[n]{c_n^p(A)} $ always exists and it is an integer. In the final part we characterize the algebras whose exponential growth is bounded by $2$.

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Elena Campedel, Ginevra Giordani, Antonio Ioppolo. 2024-05-31. Codimensions of algebras with pseudoautomorphism and their exponential growth. https://doi.org/10.1016/j.jalgebra.2025.01.015

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