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

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.

"God is or He is not...Let us weigh the gain and the loss in choosing...'God is.' If you gain, you gain all, if you lose, you lose nothing. Wager, then, unhesitatingly, that ...