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A polynomial with real positive coefficients and roots which are either negative or pairwise conjugate with negative real parts.

Two lines in hyperbolic geometry which diverge from each other in both directions.

A space having dimension n>3.

A 32-sided polygon. The regular icosidodecagon is a constructible polygon, and the regular icosidodecahedron of side length 1 has inradius r, circumradius R, and area A r = ...

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.

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.