Five lemma
- 五引理（同调代数中的五引理是关于交换图的重要引理，相当于两个相对偶的四引理之组合。适用于阿贝尔范畴和群范畴）
Five lemma
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abstract:
In mathematics, especially homological algebra and other applications of abelian category theory, the five lemma is an important and widely used lemma about commutative diagrams.
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WordNet