SURJECTION
\sɜːd͡ʒˈɛkʃən], \sɜːdʒˈɛkʃən], \s_ɜː_dʒ_ˈɛ_k_ʃ_ə_n]\
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B is surjective or onto or asurjection 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 wheref (f' x) = x since if f were not a surjection there would beelements of B for which f' was not defined.See also bijection, injection.
By Denis Howe
