Exact Sequences in Non-Exact Categories (An Application to Semimodules)

Details Exact Sequences in Non-Exact Categories (An Application to Semimodules) Exact Sequences in Non-Exact Categories (An Application to Semimodules)

2011-11-01

arxiv.org/abs/1111.0330v1

Mathematics

Category Theory

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Scientific paper

We consider a notion of exact sequences in any -not necessarily exact- pointed category relative to a given (E;M)-factorization structure. We apply this notion to introduce and investigate a new notion of exact sequences of semimodules over semirings relative to the canonical image factorization. Several homological results are proved using the new notion of exactness including some restricted versions of the Short Five Lemma and the Snake Lemma opening the door for introducing and investigating homology objects in such categories. Our results apply in particular to the variety of commutative monoids extending results in homological varieties to relative homological varieties.

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