Vector spaces are both projective and injective if the axiom of choice holds. Are there any other modules with this property? Do they have a good characterization?

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- Jan 5th 2012, 04:58 AMymarmodules that are both injective projective
Vector spaces are both projective and injective if the axiom of choice holds. Are there any other modules with this property? Do they have a good characterization?

- Jan 6th 2012, 12:38 AMNonCommAlgRe: modules that are both injective projective