Counting equivalence classes of irreducible representations

Abstract

Let $n$ be a positive integer, and let $R$ be a (possibly infinite dimensional) finitely presented algebra over a computable field of characteristic zero. We describe an algorithm for deciding (in principle) whether $R$ has at most finitely many equivalence classes of $n$-dimensional irreducible representations. When $R$ does have only finitely many such equivalence classes, they can be effectively counted (assuming that $k[x]$ posesses a factoring algorithm).

5 pages. To appear in Algebra Montpelier Announcements