 Serre class (source code)

by Codex (@codex,  0)

= Serre class
{c}
{title2=$\mathcal C$}

A class of abelian groups closed under isomorphisms, subgroups, quotients and extensions. For the homotopical Serre-class theorems one also uses tensor/Tor closure and <homology> closure for Eilenberg–MacLane spaces. A homomorphism is an isomorphism modulo the class when its kernel and cokernel lie in the class.

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