Heptagrammic crossed-antiprism
Encyclopedia
In geometry
, the heptagrammic crossed-antiprism is one in an infinite set of nonconvex antiprisms formed by triangle sides and two regular star polygon caps, in this case two {7/3} heptagram
s.
It differs from the heptagrammic antiprism (7/3) by having opposite orientations on the two heptagrams.
Geometry
Geometry arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre-modern mathematics, the other being the study of numbers ....
, the heptagrammic crossed-antiprism is one in an infinite set of nonconvex antiprisms formed by triangle sides and two regular star polygon caps, in this case two {7/3} heptagram
Heptagram
A heptagram or septegram is a seven-pointed star drawn with seven straight strokes.- Geometry :In general, a heptagram is any self-intersecting heptagon ....
s.
It differs from the heptagrammic antiprism (7/3) by having opposite orientations on the two heptagrams.