Si f : X → Y es un homomorfismo de semigrupos, probar que:
f (x $a_{b}$ 1* x $a_{b}$ 2 * … * x $a_{b}$ n) = f (x $a_{b}$ 1) * f(x $a_{b}$ 2) * … * f (x $a_{b}$ n)
en consecuencia:
f (x^n) = [f(x)]^n
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