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There are at least two distinct notions known as the Whitehead group. Given an associative ring A with unit, the Whitehead group associated to A is the commutative quotient ...

The number of ways of folding a strip of stamps has several possible variants. Considering only positions of the hinges for unlabeled stamps without regard to orientation of ...

The imaginary part I[z] of a complex number z=x+iy is the real number multiplying i, so I[x+iy]=y. In terms of z itself, I[z]=(z-z^_)/(2i), where z^_ is the complex conjugate ...

A series is an infinite ordered set of terms combined together by the addition operator. The term "infinite series" is sometimes used to emphasize the fact that series ...

The number of data points which fall within a given class in a frequency distribution.

In the archaic terminology of Whittaker and Watson (1990), the complex number z representing x+iy.

The number of single operations (of addition, subtraction, and multiplication) required to complete an algorithm.

Maximize the number of cookies you can cut from a given expanse of dough (Hoffman 1998, p. 173).

The Hamming distance between two vertices of a hypercube is the number of coordinates at which the two vertices differ.

Given a convex plane region with area A and perimeter p, then |N-A|<p, where N is the number of enclosed lattice points.