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diagonal_functor [2014/09/26 15:10] nikolaj |
diagonal_functor [2014/09/26 15:35] nikolaj |
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| ==== Discussion ==== | ==== Discussion ==== | ||
| + | === Elaboration === | ||
| + | Note that for constant functors $\Delta_A,\Delta_B$, the square in the definition of a natural transformation commutes trivially. Hence any arrow $f:{\bf C}[A,B]$ gives rise to a natural transformation. | ||
| + | |||
| === Reference === | === Reference === | ||
| Wikipedia: [[http://en.wikipedia.org/wiki/Diagonal_functor|Diagonal functor]] | Wikipedia: [[http://en.wikipedia.org/wiki/Diagonal_functor|Diagonal functor]] | ||
