1. Noun.  The act of joining; the thing joined or added.
  2. Noun.  (category theory) A form of similarity between a pair of categories mathcal{C} and mathcal{D} which is weaker than equivalence, which in turn is weaker than isomorphism. Given functors F:mathcal{C} ightarrow mathcal{D} and G:mathcal{D} ightarrow mathcal{C} , ''F'' is "left adjoint" of ''G'', and ''G'' "right adjoint" of ''F'', denoted as F dashv G , if .

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This entry was last updated on RefTopia from its source on 3/20/2012.