For lower semilinear copulas, the paper proves the tau-rho conjecture and derives exact tau-phi, phi-rho and tau-xi regions, with xi always no larger than tau, rho or phi.
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On exact regions between measures of concordance and Chatterjee's rank correlation for lower semilinear copulas
For lower semilinear copulas, the paper proves the tau-rho conjecture and derives exact tau-phi, phi-rho and tau-xi regions, with xi always no larger than tau, rho or phi.