Let MM be a convex polytope in Rn\mathbb{R}^n, with non-empty interior. We turn the group Diff(M)(M) of all CC^\infty-diffeomorphisms of MM into a regular Lie group.

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H. Gloeckner. “Diffeomorphism Groups of Convex Polytopes.” Journal of Convex Analysis 30 (2023), No. 1, 343–358.