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The continuous image of a Polish space, also called an analytic set.

A set of moves which a player plans to follow while playing a game.

Let P=(P,<=) be a partially ordered set, and let x,y,z in P. If x<=y<=z, then y is said to be between x and z. If y is between x and z and y not in {x,z}, then y is strictly ...

If the Lexis ratio L<1, a set of trials are said to be subnormal.

Lachlan's term for a set of four lines, no three of which are concurrent.

Lachlan's term for a set of four points, no three of which are collinear.

A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.

An infinite set, such as the real numbers, which is not countably infinite.

Every nonempty set of positive integers contains a smallest member.

A property of X is said to hold almost everywhere if the set of points in X where this property fails is contained in a set that has measure zero.