The closure of the set of periodic modules over a concealed canonical algebra is regular in codimension one

摘要

AbstractLet Λ be a concealed canonical algebra anddthe dimension vector of a Λ-module which is periodic respect to the action of the Auslander–Reiten translationτ. In the paper, we investigate the union of the closures of the orbits of theτ-periodic Λ-modules of dimension vectord. We show that this set is closed and regular in codimension one.]]>