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Bitwisted Burnside-Frobenius theorem and Dehn conjugacy problem
It is proved for Abelian groups that the Reidemeister coincidence number of two endomorphisms $\phi$ and $\psi$ is equal to the number of coincidence points of $\widehat\phi$ and $\widehat\psi$ on the unitary dual, if the Reidemeister number is fin