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Wikipedia definition
1. Exact sequenceAn exact sequence is a concept in mathematics, especially in ring and module theory, homological algebra, as well as in differential geometry and group theory. An exact sequence is a sequence, either finite or infinite, of objects and morphisms between them such that the image of one morphism equals the kernel of the next.
Read “Exact sequence” on English Wikipedia
Read “完全系列” on Japanese Wikipedia
Read “Exact sequence” on DBpedia

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