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A set having exactly one element a. A singleton set is denoted by {a} and is the simplest example of a nonempty set.

The small world problem asks for the probability that two people picked at random have at least one acquaintance in common.

Socrates is reported to have stated: "One thing I know is that I know nothing."

A nickname for the one-sheeted hyperboloid due to Samuel (1988, p. 95).

A point which does not lie on at least one ordinary line.

The placement of n points on a sphere so as to minimize the maximum distance of any point on the sphere from the closest one of the n points.

A spigot algorithm is an algorithm which generates digits of a quantity one at a time without using or requiring previously computed digits. Amazingly, spigot algorithms are ...

A link L is said to be splittable if a plane can be embedded in R^3 such that the plane separates one or more components of L from other components of L and the plane is ...

A fixed point for which the stability matrix has one zero eigenvector with negative eigenvalue lambda<0.

A stack is a data structure which is a special kind of list in which elements may be added to or removed from the top only. These actions are called a push or a pop, ...