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A real matrix is a matrix whose elements consist entirely of real numbers. The set of m×n real matrices is sometimes denoted R^(m×n) (Zwillinger 1995, p. 116).

An automorphism which interchanges the two vertices of a regular map at each edge without interchanging the vertices.

Consider the plane figure obtained by drawing each diagonal in a regular polygon. If each point of intersection is associated with a node and diagonals are split ar each ...

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 ...

A local-ringed space which is locally isomorphic to an affine scheme.

An Auslander algebra which connects the representation theories of the symmetric group of permutations and the general linear group GL(n,C). Schur algebras are ...

Any motion of a rigid body in space at every instant is a screw motion. This theorem was proved by Mozzi and Cauchy.

A second countable space is a topological space whose topology is second countable.

The dual polyhedron of the small dodecicosidodecahedron U_(33) and Wenninger dual W_(72).

An affine transformation that preserves area.