noun
- plural of surjection; mathematical functions where every element in the codomain is mapped to by at least one element in the domain
Usage: mathematics; formal
Examples
- The professor explained that surjections are also called onto functions.
- In set theory, surjections map every element of the target set.
- Students struggled to identify which functions were surjections.
- The homework required proving that certain mappings were surjections.
- Surjections differ from injections in their mapping properties.