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Soit \[\sigma = \begin{pmatrix}1 &2 &3 &\dots &n &n+1 &n+2 &\dots &2n \cr 1 &3 &5 &\dots &2n-1 &2 &4 &\dots &2n \end{pmatrix}.\] Calculer \(\varepsilon(\sigma)\).
Soit \[\sigma = \begin{pmatrix}1 &2 &3 &\dots &n &n+1 &n+2 &\dots &2n \cr 1 &3 &5 &\dots &2n-1 &2 &4 &\dots &2n \end{pmatrix}.\] Calculer \(\varepsilon(\sigma)\).