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Let I_A, I_B, and I_C be the vertices of the inner Soddy triangle, and also let E_A, E_B, and E_C be the pairwise contact points of the three tangent circles. Then the lines ...

The pedal curve of a rectangular hyperbola with the pedal point at the focus is a circle (left figure; Hilbert and Cohn-Vossen 1999, p. 26). The pedal curve of a rectangular ...

Through any point in the plane, there is at most one straight line parallel to a given straight line. This axiom is equivalent to the parallel postulate.

A simple polygon with precisely two ears and one mouth.

The common perpendicular to two opposite edges of a tetrahedron.

A transformation in which coordinates in two spaces are expressed rationally in terms of those in another.

Involving two variables, as opposed to many (multivariate), or one (univariate).

A flat disk that acts as a two-sided die.

Two manifolds are said to be diffeomorphic if there exists a diffeomorphism between them.

A fork of a tree T is a node of T which is the endpoint of two or more branches.