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The difference between the sum of face angles A_i at a polyhedron vertex of a polyhedron and 2pi, delta=2pi-sum_(i)A_i.

1. A fixed polyomino. 2. The set of points obtained by taking the centers of a fixed polyomino.

An anti-analytic function is a function f satisfying the condition (df)/(dz)=0. (1) Using the result ...

Construct a chain C of 2n components in a solid torus V. Now thicken each component of C slightly to form a chain C_1 of 2n solid tori in V, where pi_1(V-C_1)=pi_1(V-C) via ...

In general, an arrangement of objects is simply a grouping of them. The number of "arrangements" of n items is given either by a combination (order is ignored) or permutation ...

The triangle center with triangle center function alpha=A.

When working over a collection of fields, the base field is the intersection of the fields in the collection, i.e., the field contained in all other fields.

If g(theta) is a trigonometric polynomial of degree m satisfying the condition |g(theta)|<=1 where theta is arbitrary and real, then g^'(theta)<=m.

A common mechanism which generates singularities from smooth initial conditions.

A ring with a unit element in which every element is idempotent.