Abstract

Any algebra of finite representation type has a finite number of two-sided ideals. But there are stronger finiteness conditions that should be considered here. We consider finite-dimensional K-algebras that have only a finite number of left (respectively, principal left) ideals, up to conjugacy. We then characterize K-algebras A whose Jacobson radical satisfies J( A) 2=0, and with finitely many classes of principal left ideals. Finally, we consider basic algebras with J( A) 2=0. Here we characterize such algebras with finitely many classes of left ideals.

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