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Edward S. Letzter

Publications and source records attributed to Edward S. Letzter.

20 records · Page 2Linked to original sources

Counting equivalence classes of irreducible representations

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).

math.RA↗

Polycyclic-by-finite group algebras are catenary

We show that group algebras kG of polycyclic-by-finite groups G, where k is a field, are catenary: Given prime ideals P and P' of kG, with P contained in P', all saturated chains of primes between P and P' have the same length.

math.RA↗