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The straight polyomino of order n is the n-polyomino in which all squares are placed along a line.

Subtraction is the operation of taking the difference d=x-y of two numbers x and y. Here, x is called the minuend, y is called the subtrahend, and the symbol between the x ...

Let the speed sigma of a closed curve on the unit sphere S^2 never vanish. Then the tangent indicatrix, also called the tantrix, tau=(sigma^.)/(|sigma^.|) is another closed ...

The tetragonal trapezohedron is the dual of the square antiprism. For a square antiprism with unit edge lengths, the edge lengths of the corresponding tetragonal ...

A trace form on an arbitrary algebra A is a symmetric bilinear form (x,y) such that (xy,z)=(x,yz) for all x,y,z in A (Schafer 1996, p. 24).

The set of all centroid points in a weighted tree (Harary 1994, p. 36).

Johnson solid J_(83).

A bundle or fiber bundle is trivial if it is isomorphic to the cross product of the base space and a fiber.

The collection of twistors in Minkowski space that forms a four-dimensional complex vector space.

An error in a statistical test which occurs when a true hypothesis is rejected (a false negative in terms of the null hypothesis).