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…nd variations on the five lemma
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…nd variations on the five lemma (#7053) In this PR, it is shown that the shift of a distinguished triangle is a distinguished triangle. It is also shown that in a morphism between distinguished triangles, if two morphisms are isomorphisms, so is the third.
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…nd variations on the five lemma (#7053) In this PR, it is shown that the shift of a distinguished triangle is a distinguished triangle. It is also shown that in a morphism between distinguished triangles, if two morphisms are isomorphisms, so is the third.
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In this PR, it is shown that the shift of a distinguished triangle is a distinguished triangle. It is also shown that in a morphism between distinguished triangles, if two morphisms are isomorphisms, so is the third.