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Partial differential equation boundary conditions which give the normal derivative on a surface.

An 18-sided polygon, sometimes also called an octakaidecagon.

A change in a knot projection such that a pair of oppositely oriented strands are passed through another pair of oppositely oriented strands.

A triangle center is said to be polynomial iff there is a triangle center function f that is a polynomial in a, b, and c (Kimberling 1998, p. 46).

An irreducible algebraic integer which has the property that, if it divides the product of two algebraic integers, then it divides at least one of the factors. 1 and -1 are ...

Any geometric correlation which transforms one range into a projectively related pencil (or vice versa).

A proper subset S^' of a set S, denoted S^' subset S, is a subset that is strictly contained in S and so necessarily excludes at least one member of S. The empty set is ...

The sum of the aliquot divisors of n, given by s(n)=sigma(n)-n, where sigma(n) is the divisor function. The first few values are 0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 16, ... ...

A nickname for the one-sheeted hyperboloid due to Samuel (1988, p. 95).

A transformation characterized by an invariant line and a scale factor (one-way stretch) or two invariant lines and corresponding scale factors (two-way stretch).