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Capable of taking on one out of two possible values.

Two algebraic objects that are commutative, i.e., A and B such that A*B=B*A for some operation *, are said to commute with each other.

The two-dimensional Euclidean space denoted R^2.

The ratio of two independent estimates of the variance of a normal distribution.

A metric characterizing the difference between two knots K and K^' in S^3.

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

Two (or more) intersecting curves that are perpendicular at their intersection are said to be orthogonal.

Two or more lines or line segments which are perpendicular are said to be orthogonal.

Parallel curves, frequently called "offset curves" in computer graphics applications, are curves which are displaced from a base curve by a constant offset, either positive ...

There are at least two integrals called the Poisson integral. The first is also known as Bessel's second integral, ...