Let $G$ be a connected reductive group over $\mathbb{C}$. We fix a maximal torus $T \subset G$. Let $M,L \subset G$ be its Levi subgroups containing $T$ (note that we do note assume that $M,L$ are standard with respect to the same Borel subgroup). Let $\Delta$ be the set of roots of $(G,T)$ and $W$ is the corresponding Weyl group. Let $\Delta_M,\Delta_L\subset \Delta$ be the roots of $M,L$ respectively, $W_M,W_L\subset W$ are their Weyl groups. Assume that $\Delta_M\cap \Delta_L=\varnothing$, does this imply that $W_M\cap W_L=\{1\}$?



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