Scaliform polytope

A scaliform polytope is an isogonal polytope in four dimensions or greater that can be represented with only one edge length, without the consideration that the elements themselves are uniform. The elements of a scaliform polytope are all orbiform, however, so only Johnson solids that have a circumscribed sphere are valid cells beyond the uniform ones, and only regular polygons are valid faces. Infinite sets of scaliform polytopes can be created from the Cartesian product of a scaliform polytope and either a regular polygon or a 3D antiprism; these exist in six dimensions or greater.

The concept was first considered in 2000 after Richard Klitzing's discovery of the truncated tetrahedral cupoliprism, the simplest convex, non-uniform scaliform polychoron. Jonathan Bowers coined the name "scaliform" from the words "scale" and "uniform".

In 4D, there are only four convex scaliform polychora: the truncated tetrahedral cupoliprism, the bi-icositetradiminished hexacosichoron, the prismatorhombisnub icositetrachoron, and the swirlprismatodiminished rectified hexacosichoron. If we include non-convex cases, the total number of known scaliform polychora rises to at least 855, though like with the uniform polychora this list is not known to be complete.

In 5D, the duoantiwedges form an infinite family of scaliform polytera. There are also infinite families such as the polygonal dispehnoids and duoprismatic cupoliprisms, though in each case only one member is convex. The number of total scaliform polytopes in 5D and higher is not yet known, as little research has been done.