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Word: surjection
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Meaning:
Noun:
- math A function of "many-to-one" mapping relationship; more formally, ''f'': ''X'' → ''Y'' is a surjection if and only if, for every ''y'' in the codomain ''Y'', there is at least one ''x'' in the domain ''X'' with ''f''(''x'') = ''y''.
Source: Wiktionary
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