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Let X and Y be topological spaces. Then their join is the factor space X*Y=(X×Y×I)/∼, (1) where ∼ is the equivalence relation (x,y,t)∼(x^',y^',t^')<=>{t=t^'=0 and x=x^'; or ; ...

A nickname for the one-sheeted hyperboloid due to Samuel (1988, p. 95).

Sparklines are word-like graphics that have an intensity of visual distinctions comparable to words or letters (Tufte 2006, p. 4).

An affine transformation that preserves area.

A Jordan algebra which is isomorphic to a subalgebra.

An integer matrix whose entries satisfy a_(ij)={0 if j>i+1; -1 if j=i+1; 0 or 1 if j<=i. (1) There are 2^(n-1) special minimal matrices of size n×n.

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

If the difference between the order and the dimension of a series is less than the curve genus, then the series is special.

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

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 ...