Standard parabolic subgroup
= Standard parabolic subgroup
{title2=$W_J$}
For $J\subseteq I$, the standard parabolic subgroup is $W_J=\langle s_j:j\in J\rangle$. Its cosets index faces of a fixed type in the <Coxeter complex>.
= Standard parabolic subgroup
{title2=$W_J$}
For $J\subseteq I$, the standard parabolic subgroup is $W_J=\langle s_j:j\in J\rangle$. Its cosets index faces of a fixed type in the <Coxeter complex>.