Discrete logarithm as a hidden subgroup problem: $f(a,b) = g^a x^{-b}$ is a homomorphism with kernel the multiples of $(r,1)$

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Discrete logarithm as a hidden subgroup problem: $f(a,b) = g^a x^{-b}$ is a homomorphism with kernel the multiples of $(r,1)$ · Prove2Me