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Let A be a concealed canonical algebra and d the dimension vector of anA-module which is periodic respect to the action of the Auslander-Reitentranslation In the paper, we investigate the union of the closures of theorbits of the periodic A-modules of dimension vector d. We show that this setis closed and regular in codimension one.

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