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A surface which has no edges.

A vector whose elements are complex numbers.

Computer algebra is a diffuse branch of mathematics done with computers that encompasses both computational algebra and analysis.

K=-e^2, where e is the eccentricity of a conic section.

The number of elements of a group in a given conjugacy class.

If the consistency of one of two propositions implies the consistency of the other, the first is said to have greater consistency strength.

No A is not-A.

An immediate consequence of a result already proved. Corollaries usually state more complicated theorems in a language simpler to use and apply.

The largest n such that |z_n|<4 in a Mandelbrot set. Points of different count are often assigned different colors.

If X and Y are independent variates and X+Y is a normal distribution, then both X and Y must have normal distributions. This was proved by Cramér in 1936.