Definition:Antihomomorphism/Field Antihomomorphism
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Definition
Let $\struct {R, +, \circ}$ and $\struct {S, \oplus, *}$ be fields.
Then a ring antihomomorphism $\phi: \struct {R, +, \circ} \to \struct {S, \oplus, *}$ is called a field antihomomorphism.