homomorphism
Etymology

From homo- + morphism.

Noun

homomorphism (plural homomorphisms)

  1. (algebra) A structure-preserving map between two algebraic structures of the same type, such as group, ring, or vector spaces.
    Coordinate term: homology
    A field homomorphism is a map from one field to another one which is additive, multiplicative, zero-preserving, and unit-preserving.
    • 1954, Kuo-Tsai Chen, Iterated Integrals and Exponential Homomorphisms, Proceedings of the London Mathematical Society, Reprinted in 2001, Philippe Tondeur (editor), Collected Papers of K.-T. Chen, Birkhäuser, page 54 ↗,
      This motivates a generalization, and exponential homomorphisms are now defined, in an algebraic fashion, from certain free products to formal power series rings with non-commutative indeterminates.
  2. (biology) A similar appearance of two unrelated organisms or structures, as for example with fish and whales.
    Coordinate term: homology
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