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A right-angled parallelepiped with dimensions a×ab×abc, where a, b, and c are integers.

Related to one another by a homomorphism.

A geometric figure which touches only the sides (or interior) of another figure.

A line segment on the boundary of a face, also called a side.

A point at which two polygon edges of a polygon meet.

If a is (directly) proportional to b, then a/b is a constant. The relationship is written a proportional b, which implies a=cb, for some constant c known as the constant of ...

The necessary condition for the polychoron to be regular (with Schläfli symbol {p,q,r}) and finite is cos(pi/q)<sin(pi/p)sin(pi/r). Sufficiency can be established by ...

The robustness of a given outcome to small changes in initial conditions or small random fluctuations. Chaos is an example of a process which is not stable.

If the Lexis ratio L<1, a set of trials are said to be subnormal.

The polygon formed by the lines tangent to the circumcircle of a polygon. The tangential polygon of an n-gon is itself an n-gon.