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A 13-sided polygon, sometimes also called the triskaidecagon.

In the American system, 10^(36).

A function of a single variable (e.g., f(x), g(z), theta(xi), etc.).

If A is true unless B, then not-B implies A, but B does not necessarily imply not-A.

A homogeneous ideal defining a projective algebraic variety is unmixed if it has no embedded prime divisors.

Kepler's original name for the small stellated dodecahedron.

Zero is the integer denoted 0 that, when used as a counting number, means that no objects are present. It is the only integer (and, in fact, the only real number) that is ...

A k-chain whose bounding (k-1)-chain vanishes.

A square number, also called a perfect square, is a figurate number of the form S_n=n^2, where n is an integer. The square numbers for n=0, 1, ... are 0, 1, 4, 9, 16, 25, 36, ...

The Ramsey number R(m,n) gives the solution to the party problem, which asks the minimum number of guests R(m,n) that must be invited so that at least m will know each other ...