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A straightedge with markings to indicate distances. Although geometric constructions are sometimes said to be performed with a ruler and compass, the term straightedge is ...

The dual polyhedron of the small cubicuboctahedron U_(13) and Wenninger dual W_(69).

Given a point set P={x_n}_(n=0)^(N-1) in the s-dimensional unit cube I=[0,1)^s, the star discrepancy is defined as D_N^*(P)=sup_(J in Upsilon^*)D(J,P), (1) where the local ...

A subring of a ring R is a subgroup of R that is closed under multiplication.

The symbol ∼ used to denote similarity, equivalence relations, or asymptosy.

A system in which a strange loop appears.

An operator T which maps some basic polynomial sequence p_n(x) into another basic polynomial sequence q_n(x).

An aliquot sequence computed using the analog of the restricted divisor function s^*(n) in which only unitary divisors are included.

Perspective is the art and mathematics of realistically depicting three-dimensional objects in a two-dimensional plane, sometimes called centric or natural perspective to ...

The simple process of voting leads to surprisingly counterintuitive paradoxes. For example, if three people vote for three candidates, giving the rankings A, B, C; B, C, A; ...