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The exact region determined by Blomqvist's beta, Spearman's footrule and Kendall's tau
We determine the exact region $Ω_{β,ϕ,τ}= \{(β(C),ϕ(C),τ(C))\mid C\in\mathcal{C}\}$ of possible joint values of Blomqvist's beta, Spearman's footrule and Kendall's tau over the class $\mathcal{C}$ of all bivariate copulas. The region consists precisely of all triples $(β,ϕ,τ)$ satisfying $-1\le β\le
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