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If the difference between the order and the dimension of a series is less than the curve genus, then the series is special.

A three-dimensional knot spun about a plane in four dimensions. Unlike suspended knots, spun knots are smoothly embedded at the poles.

An n×n array is called a square array. Considered as a matrix, a square array is called a square matrix.

A function f(x) is said to be square integrable if int_(-infty)^infty|f(x)|^2dx is finite.

A space which is isomorphic to a Borel subset B of a Polish space equipped with its sigma-algebra of Borel sets.

A point x_0 at which the derivative of a function f(x) vanishes, f^'(x_0)=0. A stationary point may be a minimum, maximum, or inflection point.

If, in a plane or spherical convex polygon ABCDEFG, all of whose sides AB, BC, CD, ..., FG (with the exception of AG) have fixed lengths, one simultaneously increases ...

The asymptotic series of the Airy function Ai(z) (and other similar functions) has a different form in different sectors of the complex plane.

A knot used to prevent the end of a string from slipping through a hole.

Two numbers which are relatively prime.