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Assemble six 1×2×2 blocks and three 1×1×1 blocks into a 3×3×3 cube.

The dual polyhedron of the small dodecicosahedron U_(50) and Wenninger dual W_(90).

The space join of a topological space X and a point P, C(X)=X*P.

Two numbers which are relatively prime.

For a discrete function f(n), the summatory function is defined by F(n)=sum_(k in D)^nf(k), where D is the domain of the function.

A system in which a strange loop appears.

The trace of a second-tensor rank tensor T is a scalar given by the contracted mixed tensor equal to T_i^i. The trace satisfies ...

An irregular dodecahedron.

A constant sometimes called Varga's constant is defined by V=1/Lambda=9.2890254919... (OEIS A073007), where Lambda is the one-ninth constant.

Let S be a set of simple polygonal obstacles in the plane, then the nodes of the visibility graph of S are just the vertices of S, and there is an edge (called a visibility ...