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Given a polynomial in a single complex variable with complex coefficients p(z)=a_nz^n+a_(n-1)z^(n-1)+...+a_0, the reciprocal polynomial is defined by ...

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.

When can homology classes be realized as the image of fundamental classes of manifolds? The answer is known, and singular bordism groups provide insight into this problem.

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.