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We construct, for any double complex in an abelian category, certain ``short-distance'' maps, and an exact sequence involving these, instances of which can be pieced together to give the ``long-distance'' maps and exact sequences of results such as the Snake Lemma.Further applications are given. We also note what the building blocks of an analogous study of triple complexes would be.
@article{TAC_2012_26_a2, author = {George M. Bergman}, title = {On diagram-chasing in double complexes}, journal = {Theory and applications of categories}, pages = {60--96}, publisher = {mathdoc}, volume = {26}, year = {2012}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2012_26_a2/} }
George M. Bergman. On diagram-chasing in double complexes. Theory and applications of categories, Tome 26 (2012), pp. 60-96. http://geodesic.mathdoc.fr/item/TAC_2012_26_a2/