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A linkage which converts circular to linear motion using a hinged square.

The mathematical study of the scattering operator and Schrödinger equation.

A correspondence between a permutation and a pair of Young tableaux.

An algorithm that can always be used to decide whether a given polynomial is free of zeros in the closed unit disk (or, using an entire linear transformation, to any other ...

A functor which defines an equivalence of module categories.

The problem of determining the vertices of a Schwarz-Christoffel mapping (Krantz 1999, p. 176).

The second isodynamic point S^' has triangle center function alpha=sin(A-1/3pi) and is Kimberling center X_(16) (Kimberling 1998, p. 69).

The second power point is the triangle center with triangle center function alpha_(31)=a^2. It is Kimberling center X_(31).

Eliminate each knot crossing by connecting each of the strands coming into the crossing to the adjacent strand leaving the crossing. The resulting strands no longer cross but ...

A polyhedron that is dual to itself. For example, the tetrahedron is self-dual. Naturally, the skeleton of a self-dual polyhedron is a self-dual graph. Pyramids are ...