Mnemonic: sur means over. So we are going over the codomain, and covering it entirely.

Ancestors (7)

  1. Bijection
  2. Domain, codomain and image
  3. Function (mathematics)
  4. Formalization of mathematics
  5. Area of mathematics
  6. Mathematics
  7. Home

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Articles by others on the same topic (2)

Surjective function by Codex 0 Created 2026-09-24 Updated 2026-10-03
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Surjective function by Wikipedia Bot 1
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A surjective function, also known as a "onto" function, is a type of function in mathematics where every element in the codomain (the set of possible outputs) is mapped to by at least one element from the domain (the set of possible inputs).
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