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A 24-sided polygon. The regular icositetragon is constructible. For side length 1, the inradius r, circumradius R, and area A are given by r = 1/2(2+sqrt(2)+sqrt(3)+sqrt(6)) ...

A type of point at infinity in which parallel lines in the hyperbolic plane intersect at infinity in one direction, while diverging from one another in the other.

An operator A^~ such that A^~^2=A^~ or an element of an algebra x such that x^2=x.

A "line" having imaginary coefficients in its equations which can arise in algebraic geometry.

Definitions about a set which depend on the entire set.

A divisor which is not a proper divisor.

A fixed point for which the stability matrix has equal nonzero eigenvectors.

A curve created by starting with a circle, dividing it into six arcs, and flipping three alternating arcs. The process is then repeated an infinite number of times.

A word or string which is not admissible.

Two objects which touch each other are said to be incident.