nonhereditary module

From: Ignat Soroko <ignat.soroko@xxxxxxxxx>
Date: 27 Jun 2007 07:40:02 -0400

What is the simplest example of a projective module having a submodule
which is not projective? And the similar question for injective
modules: what is an example of injective module having quotient module
which is not injective?

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