Almost minimal systems and periodicity in hyperspaces

Given a self-map of a compact metric space X, we study periodic points of the map induced on the hyperspace of closed non-empty subsets of X. We give some necessary conditions on admissible sets of periods for these maps. Seemingly unrelated to this, we construct an almost totally minimal homeomorphism of the Cantor set. We also apply our theory to give a full description of admissible period sets for induced maps of the interval maps. The description of admissible periods is also given for maps induced on symmetric products.