MODULES THAT ARE INVARIANT WITH RESPECT TO AUTOMORPHISMS AND IDEMPOTENT ENDOMORPHISMS OF THEIR HULLS AND COVERS

摘要

The paper contains both known and new results on automorphism-invariant modules, automorphism-coinvariant modules and modules which are invariant or coinvariant with respect to idempotent endomorphisms of its hull and its cover, respectively. The main results are given with proofs.