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a morphism f is a structure preserving mapping, and under a morphism the following holds: f(ab) = f(a)f(b)

what is the name for a similar concept but where instead we have:

f(ab) = f(b)f(a)

This happens for example for the element inversion in a group: [tex](ab)^{-1}=b^{-1}a^{-1}[/tex].

I found it somewhere, some time ago, but I cannot find it anymore. I thought it was something like antimorphism, but I would not bet a cent on it.

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# What is the name for f(ab)=f(b)f(a)?

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