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Let u^_ denote the mean of a set of quantities u_i, then the absolute deviation is defined by Deltau_i=|u_i-u^_|.

The set C_(n,m,d) of all m-D varieties of degree d in an n-dimensional projective space P^n into an M-D projective space P^M.

The set closure St^_v of a star Stv at a vertex v of a simplicial complex K.

Given a set S of points in the plane, an enclosing circle is a circle for which all points S lie in its interior.

The map which assigns every member of a set A to the same element id_A. It is identical to the identity function.

"The integers" is a common way of referring to the set of integers, commonly denoted Z.

Given a positive integer n, a labeled n-digraph is a digraph whose vertex set is {1,...,n}.

Let u^_ denote the mean of a set of quantities u_i, then the relative deviation is defined by (Deltau_i)/(u^_)=(|u_i-u^_|)/(u^_).

For any two points x,y in X, there is an open set U such that x in U and y not in U or y in U and x not in U. A space fulfilling this axiom is called a T0-space.

The first corona of a tile is the set of all tiles that have a common boundary point with that tile (including the original tile itself). The second corona is the set of ...