Énoncé mathématique des principes de la statique/Principe des actions mutuelles

$\left\{\begin{array}{c}{𝒯}_{0\to 1}\end{array}\right\}={\left\{\begin{array}{cc}X& L\\ Y& M\\ Z& N\end{array}\right\}}_{A,R}\iff \left\{\begin{array}{c}-{𝒯}_{1\to 0}\end{array}\right\}={\left\{\begin{array}{cc}-X& -L\\ -Y& -M\\ -Z& -N\end{array}\right\}}_{A,R}$