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The number k in the expression s(n)=kn for a multiperfect number is called its class.

A nonuniform rational B-spline surface of degree (p,q) is defined by ...

Given the center of a circle, divide the circle into four equal arcs using a compass alone (a Mascheroni construction).

An assemblage of faces forming a polyhedron of zero volume (Holden 1991, p. 124).

A geometry in which Archimedes' axiom does not hold.

A null function delta^0(x) satisfies int_a^bdelta^0(x)dx=0 (1) for all a,b, so int_(-infty)^infty|delta^0(x)|dx=0. (2) Like a delta function, they satisfy delta^0(x)={0 x!=0; ...

A number theoretic function is a function whose domain is the set of positive integers.

A linear real-valued function omega^1 of vectors v such that omega^1(v)|->R. Vectors (i.e., contravariant vectors or "kets" |psi>) and one-forms (i.e., covariant vectors or ...

In a topological space X, an open neighborhood of a point x is an open set containing x. A set containing an open neighborhood is simply called a neighborhood.

For a partial order, the size of the longest antichain is called the width.