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Non-commutative rings and algebras, non-associative algebras, universal algebra and lattice theory, linear algebra, semigroups. For questions specific to commutative algebra (that is, rings that are assumed both associative and commutative), rather use the tag ac.commutative-algebra.

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Selmer complex and total complex

You should view the morphisms of complexes of the notation with Tot as complexes of complexes concentrated in only two degrees with differential given by the morphism, which is a particularly simple c …
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