最終更新日:2022/12/24

A flag of P is a sequence (F₀, F₁, ..., Fₘ) of faces of P such that dim Fᵢ = i for each i and Fᵢ is a side of Fᵢ₊₁ for each i < m.[…]A regular polytope in X is a polytope P in X whose group of symmetries in acts transitively on its flags.

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