论文信息 - Completely coretractable rings

Completely coretractable rings

A module M is said to be coretractable if there exists a non-zero homomorphism of every non-zero factor of M into M . We prove that all right (left) modules over a ring are coretractable if and only if the ring is Morita equivalent to a finite product of local right and left perfect rings.

Žemlička Jan

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