noun, noun which may take the genitive case particle 'no'
surjection; onto mapping; epimorphism
Mathematics term for a function where every element of the codomain is mapped to by at least one element of the domain. Used in set theory and category theory.
This mapping is a surjection.
Please check the definition of surjection.
Compound of 全 (ぜん, 'all, entire') and 射 (しゃ, 'mapping, projection'), a calque from Western mathematical terminology.