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

A version of fractal dimension used in time-series analysis.

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.

A space having dimension n>3.

A 32-sided polygon. The regular icosidodecagon is a constructible polygon, and the regular icosidodecahedron of side length 1 has inradius r, circumradius R, and area A r = ...

A 24-sided polygon. The regular icositetragon is constructible. For side length 1, the inradius r, circumradius R, and area A are given by r = 1/2(2+sqrt(2)+sqrt(3)+sqrt(6)) ...

A "line" having imaginary coefficients in its equations which can arise in algebraic geometry.

Definitions about a set which depend on the entire set.