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onto ==>
surjection definition
<mathematics > 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.
(1995-05-27)
Nearby terms:
Sure « surfing « SURGE « surjection » surjective » surrogate key » suspension
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