## Ghost characters and character varieties of 2-fold branched covers. (arXiv:1708.01511v1 [math.GT])

It is known that for any knot $K$ every (meridionally) trace-free $SL_2(C)$-representation of the knot group $G(K)$ gives an $SL_2(C)$-representation of the fundamental group $\pi_1(\Sigma_2K)$ of the

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