SURJECTION

Etymology

Noun

surjection (plural surjections)

(set theory) A function that is a many-to-one mapping; (formally) Any function $\backslash (f:\; X\backslash rightarrow\; Y\backslash )$ for which for every $\backslash (y\; \backslash in\; Y\backslash )$, there is at least one $\backslash (x\; \backslash in\; X\backslash )$ such that $\backslash (f(x)\; =\; y\backslash )$.

Synonyms

• (function that is a many-to-one mapping): surjective function

Source: Wiktionary

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