an estate diamond; estate jewelry

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.

Canada at the turn of the century had become the breadbasket of the British Empire and industrialised Europe and wheat grown on the prairies was consolidated in elevator at Fort William, Ontario to await shipment overseas.

Silence the critics.