In mathematics, a regular polytope is a polytope whose symmetry group acts transitively on its flags, thus giving it the highest degree of symmetry.All its elements or j-faces (for all 0 ≤ j ≤ n, where n is the dimension of the polytope) — cells, faces and so on — are also transitive on the symmetries of the polytope, and are regular polytopes of dimension ≤ n.

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Jede Strecke, die einen inneren und einen äußeren Punkt verbindet, schneidet den Rand in genau einem Punkt. Der Durchschnitt zweier eigentlicher Polytope mit einem gemeinsamen inneren Punkt ist wieder ein eigentliches Polytop. Durch Induktion folgt dasselbe für endlich viele eigentliche Polytope mit einem gemeinsamen inneren Punkt.

A hypercube can be defined by increasing the numbers of dimensions of a shape: 0 – A point is a hypercube of dimension zero. 1 – If one moves this point one unit length, it will sweep out a line segment, which is a unit hypercube of dimension one. 2 – If one moves this line segment its length in a perpendicular direction from itself; it sweeps out a 2-dimensional square.