Abyzov A.N.; Eryashkin M.S.
(2021)
A right R-module M is called: (1) retractable if HomR(M,N)≠0 for any non-zero submodule N of M; (2) coretractable if HomR(M/N,M)≠0 for any proper submodule N of M. It shows that if M is locally noetherian and every nonzero ...