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When all the points P on one line are related by an isometry to all points P^' on another, the midpoints of the segments PP^' are either distinct and collinear or coincident.

The number of inward directed graph edges from a given graph vertex in a directed graph.

The symmetry operation (x,y,z)->(-x,-y,-z). When used in conjunction with a rotation, it becomes an improper rotation.

A sequence {a_n} such that either (1) a_(i+1)>=a_i for every i>=1, or (2) a_(i+1)<=a_i for every i>=1.

A strong inequality in which a is not only less than b, but much less (by some convention) is denoted a<<b.

A homogeneous polynomial in two or more variables.

The type of homology which results when the spaces being studied are restricted to simplicial complexes and subcomplexes.

A long division in which most or all of the digits are replaced by a symbol (usually asterisks) to form a cryptarithmetic.

In the American system, 10^(42).

An integer n which is tested to see if it divides a given number.