Great duoantiprism


In geometry, the great duoantiprism is the only uniform star-duoantiprism solution in 4-dimensional geometry. It has Schläfli symbol or Coxeter diagram, constructed from 10 pentagonal antiprisms, 10 pentagrammic crossed-antiprisms, and 50 tetrahedra.
Its vertices are a subset of those of the small stellated 120-cell.

Construction

The great duoantiprism can be constructed from a nonuniform variant of the 10-10/3 duoprism where the decagram's edge length is around 1.618 times the edge length of the decagon via an alternation process. The decagonal prisms alternate into pentagonal antiprisms, the decagrammic prisms alternate into pentagrammic crossed-antiprisms with new regular tetrahedra created at the deleted vertices. This is the only uniform solution for the p-q duoantiprism aside from the regular 16-cell.

Other names

Great duoantiprism Jonathan Bowers