Gauge invariance of Wilson loops: $\operatorname{tr}\rho(U^g_\gamma) = \operatorname{tr}\rho(U_\gamma)$ for loops inside the box

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Gauge invariance of Wilson loops: $\operatorname{tr}\rho(U^g_\gamma) = \operatorname{tr}\rho(U_\gamma)$ for loops inside the box · Prove2Me