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We obtain conditions of uniform continuity for endomorphisms of free-abeliantimes free groups for the product metric defined by taking the prefix metric ineach component and establish an equivalence between uniform continuity for thismetric and the preservation of a coarse-median, which was recently introducedby Fioravanti. Considering the extension of an endomorphism to the completionwe count the number of orbits for the action of the subgroup of fixed points(resp. periodic) points on the set of infinite fixed (resp. periodic) points.Finally, we study the dynamics of infinite points: for some endomorphisms,defined in a precise way, fitting a classification given by Delgado andVentura, we prove that every infinite point is either periodic or wandering,which implies that the dynamics is asymptotically periodic. We also prove thelatter for the case of automorphisms.

On the dynamics of extensions of free-abelian times free groups endomorphisms to the completion