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An n×n matrix A is an elementary matrix if it differs from the n×n identity I_n by a single elementary row or column operation.

An n-gonal pyramid adjoined to an n-gonal prism.

A stellation is said to be fully supported if all its included cells are supported, i.e., if all its bottom faces are covered by their adjacent cells. In other words, every ...

G = int_0^infty(e^(-u))/(1+u)du (1) = -eEi(-1) (2) = 0.596347362... (3) (OEIS A073003), where Ei(x) is the exponential integral. Stieltjes showed it has the continued ...

An n-gonal pyramid adjoined to the top of an n-gonal antiprism. In the 3-gonal gyroelongated pyramid, the pyramid and lateral antiprism are coplanar. However, the 4-gonal and ...

A hyperbolic version of the Euclidean cube.

A hyperbolic version of the Euclidean icosahedron.

Three impossible ways to combine four bars.

A formula which counts the number of fixed points for a topological transformation.

The pentagonal gyrocupolarotunda is a convex equilateral solid that is Johnson solid J_(33). The unit pentagonal gyrocupolarotunda has volume V=5/(12)(11+5sqrt(5)) (1) and ...