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1 definition found
 for surjection
From The Free On-line Dictionary of Computing (18 March 2015) :

      A function f : A -> B is surjective or onto or a
     surjection if f A = B.  I.e. f can return any value in B.
     This means that its image is its codomain.
     Only surjections have right inverses, f' : B -> A where
     f (f' x) = x since if f were not a surjection there would be
     elements of B for which f' was not defined.
     See also bijection, injection.

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