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The number of digits used to perform a given computation. The concepts of accuracy and precision are both closely related and often confused. While the accuracy of a number x ...

A group of four elements, also called a quadruplet or tetrad.

A robust estimation based on a rank test.

The distance from the center of a circle to its perimeter, or from the center of a sphere to its surface. The radius is equal to half the diameter.

The sum of the reciprocals of roots of an equation equals the negative coefficient of the linear term in the Maclaurin series.

A cross also called the tau cross or crux commissa, illustrated schematically above in polyomino form.

Let f be analytic on the unit disk, and assume that 1. |f(z)|<=1 for all z and 2. f(0)=0. Then |f(z)|<=|z| and |f^'(0)|<=1. If either |f(z)|=|z| for some z!=0 or if ...

A family composed of countably many discrete families.

Let a, b, and c be the sides of a spherical triangle, then the spherical defect is defined as D=2pi-(a+b+c).

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