Search Results for ""

Two vectors u and v are parallel if their cross product is zero, i.e., uxv=0.

The Pasch graph is the Levi graph of the Pasch configuration. The Pasch graph is edge-transitive but not vertex-transitive, but fails to be semisymmetric since it is not ...

A heptomino in the shape of the Greek character pi.

A braid in which strands are intertwined in the center and are free in "handles" on either side of the diagram.

There exist a variety of formulas for either producing the nth prime as a function of n or taking on only prime values. However, all such formulas require either extremely ...

The product of any number of perspectivities.

((a+b)/2)^2-((a-b)/2)^2=ab.

A group of five elements, also called a quintuple or pentad.

An (n-2)-dimensional face of an n-dimensional polytope.

The Robertson-Wegner graph is of the four (5,5)-cage graphs, also called Robertson's cage (Read and Wilson 1998, p. 273). Like the other (5,5)-cages, the Robertson-Wegner ...