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A rewriting of a given quantity (e.g., a matrix) in terms of a combination of "simpler" quantities.

The study of definable sets and functions in polish spaces.

An integer used to generate a digitaddition. A number can have more than one generator. If a number has no generator, it is called a self number.

A tetrahedron with identical isosceles or scalene faces.

A divergenceless vector field, also called a solenoidal field, is a vector field for which del ·F=0. Therefore, there exists a G such that F=del xG. Furthermore, F can be ...

The Doppler spiral is the curve obtained from an Archimedes' spiral which is translated horizontally with speed k. It has parametric equations x(t) = a(tcost+kt) (1) y(t) = ...

A dual number is a number x+epsilony, where x,y in R and epsilon is a matrix with the property that epsilon^2=0 (such as epsilon=[0 1; 0 0]).

An edge automorphism of a graph G is a permutation of the edges of G that sends edges with common endpoint into edges with a common endpoint. The set of all edge ...

A graph vertex in a graph is said to be an even node if its vertex degree is even.

A statement which is rigorously not true. Regular two-valued logic allows statements to be only true or false, but fuzzy logic treats "truth" as a continuum which can have a ...