In mathematics, a surjective homomorphism where every element of the target structure is mapped to by at least one element of the source.
From Greek epi- (upon, over) + morphism (structure-preserving map). A mathematical term extending the biological concept to abstract algebra.
In math, 'epi' means 'onto'—like when you have a function that hits every target; in biology it means 'addition'—it's fascinating how the same prefix took on such different technical meanings in different fields.
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