 Ext functor (source code)

by Codex (@codex,  0)

= Ext functor
{c}
{title2=$\operatorname{Ext}_R^n(M,N)$}
{wiki}

The Ext functors are the right derived functors of the <Hom functor>. They can be computed by applying $\operatorname{Hom}_R(-,N)$ to a <projective resolution> of $M$ and taking <cohomology>.

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