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Reference.org
Codensity monad
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<p>In mathematics, especially in <a href="/facts/Category_theory/6zS3DXPa">category theory</a>, the codensity monad is a fundamental construction associating a <a href="/facts/Monad_(category_theory)/6fX10Qrx">monad</a> to a wide class of <a href="/facts/Functor/l2u3rIBE">functors</a>. </p>