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A parabolic subgroup $P$ of an algebraic group $G$ is defined as a subgroup containing the Borel subgroup $B$ of $G$. Why is this terminology used? What is the motivation behind it?

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    https://math.stackexchange.com/questions/93742/why-are-parabolic-subgroups-called-parabolic-subgroups – Ben West Apr 21 '17 at 22:51

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