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A field K is said to be algebraically closed if every polynomial with coefficients in K has a root in K.

An ambiguous term which is sometimes used to mean a partially ordered set and sometimes to mean a totally ordered set.

The sample variance m_2 (commonly written s^2 or sometimes s_N^2) is the second sample central moment and is defined by m_2=1/Nsum_(i=1)^N(x_i-m)^2, (1) where m=x^_ the ...

In set theory, a unary operation on set A is a function A->A. More generally, a unary operation is a function with exactly one operand, such as the factorial, square root, or ...

The Pythagorean means are the three "classic" means A (the arithmetic mean), G (the geometric mean), and H (the harmonic mean) are sometimes known as the Pythagorean means. ...

The term "ill-defined" is also used informally to mean ambiguous.

The mean square deviation of the best local fit straight line to a staircase cumulative spectral density over a normalized energy scale.

The use of three prior points in a root-finding algorithm to estimate the zero crossing.

Consider the process of taking a number, adding its digits, then adding the digits of the number derived from it, etc., until the remaining number has only one digit. The ...

Consider a line segment of length 1, and pick a point x at random between [0,1]. This point x divides the line into line segments of length x and 1-x. If a set of points are ...