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A circle-preserving transformation composed of an even number of inversions.

Related to one another by a homomorphism.

A set of statistical distributions having the same variance.

Oriented in position perpendicular to up-down, and therefore parallel to a flat surface.

The locus of a point which is derived from a fixed point Q by continuous parallel displacement.

Determined the possible values of r and n for which there is an identity of the form (x_1^2+...+x_r^2)(y_1^2+...+y_r^2)=z_1^2+...+z_n^2.

A polynomial with real positive coefficients and roots which are either negative or pairwise conjugate with negative real parts.

A connection between two or more vertices of a hypergraph. A hyperedge connecting just two vertices is simply a usual graph edge.

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

A space having dimension n>3.