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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- January 5th 2012, 03:58 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?

- January 5th 2012, 11:38 PMNonCommAlgRe: modules that are both injective projective