Short five lemma
= Short five lemma
The <Five lemma> has a short form: in a commutative diagram of short exact sequences, if the maps on both outer terms are isomorphisms, then the map on the middle terms is an isomorphism.
= Short five lemma
The <Five lemma> has a short form: in a commutative diagram of short exact sequences, if the maps on both outer terms are isomorphisms, then the map on the middle terms is an isomorphism.