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surjection

Pronunciation: /sɜː(ɹ)ˈd͡ʒɛk.ʃən/

The English word “surjection” has 1 meaning listed here.

noun

  1. A function for which every element of the codomain is mapped to by some element of the domain; (formally) Any function f:X→Y for which for every y∈Y, there is at least one x∈X such that f(x)=y.

Etymology

From French surjection, introduced by the Bourbaki group in their treatise Éléments de mathématique. Ultimately borrowed from Latin superiectiō (“a throwing over or on; (fig.) an exaggeration, a hyperbole”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.