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A Jordan algebra which is isomorphic to a subalgebra.

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

A graphical partitioning based on the eigenvalues and eigenvectors of the Laplacian matrix of a graph.

The mean square deviation of the best local fit straight line to a staircase cumulative spectral density over a normalized energy scale.

A spectrum sequence is a sequence formed by successive multiples of a real number a rounded down to the nearest integer s_n=|_na_|. If a is irrational, the spectrum is called ...

The maximum cardinal number of a collection of subsets of a t-element set T, none of which contains another, is the binomial coefficient (t; |_t/2_|), where |_x_| is the ...

Johnson solid J_(86).

Johnson solid J_(88).

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 curve on the surface of a sphere. Examples include the baseball cover, Seiffert's spherical spiral, spherical helix, and spherical spiral.