Schanuel's lemma (Q1816943)

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lemma stating that, given two short exact sequences of R-modules K→P→M and K′→P′→M, if P and P′ are projective, then K⊕P′ is isomorphic to K′⊕P.
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English
Schanuel's lemma
lemma stating that, given two short exact sequences of R-modules K→P→M and K′→P′→M, if P and P′ are projective, then K⊕P′ is isomorphic to K′⊕P.

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