DOI 10.1515/taa-2015-0005 Received August 20, 2014; accepted August 16, 2015 Abstract: The intrinsic algebraic entropy ̃︂ ent(φ) of an endomorphism φ of an Abelian group G can be computed using fully inert subgroups of φ-invariant sections of G, instead of the whole family of φ-inert subgroups. For a class of groups containing thegroupsof finite rank, aswell as those groupswhichare trajectories ...