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Constant function

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Constant functions are those functions which assign to each point in their domain of definition the same "constant" value of the codomain,

If B is a ring, then the set of all constant functions from A to B (for any arbitrary non-empty A) is a subring of the ring of functions from A to B, isomorphic to B.


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Two important constant functions in the OEIS are A000004 (where for all ) and A000012 ().