Noun, Noun which may take the genitive case particle 'no'
1. surjection; onto mapping; epimorphismMathematics
Wikipedia definition
2. Surjective functionIn mathematics, a function f from a set X to a set Y is surjective (or onto), or a surjection, if every element y in Y has a corresponding element x in X so that f(x) = y. Multiple elements of X might be turned into the same element of Y by applying f.
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