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If an infinite number of points in the plane are all separated by integer distances, then all the points lie on a straight line.

A transformation which has only trivial invariant subsets is said to be ergodic.

A gyrobicupola is a bicupola in which the bases are in opposite orientations.

Two nonsingular forms are equivalent over the rationals iff they have the same determinant and the same p-signatures for all p.

A set of statistical distributions having different variances.

A 6-polyabolo.

Related to one another by a homomorphism.

Definitions about a set which depend on the entire set.

The number of inward directed graph edges from a given graph vertex in a directed graph.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.