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The cumulative frequency in a frequency distribution divided by the total number of data points.

The ratio of the absolute frequency to the total number of data points in a frequency distribution.

The sequency k of a Walsh function is defined as half the number of zero crossings in the time base.

A tree having an infinite number of branches and whose nodes are sequences generated by a set of rules.

A matrix is ill-conditioned if the condition number is too large (and singular if it is infinite).

An algebraic variety is a generalization to n dimensions of algebraic curves. More technically, an algebraic variety is a reduced scheme of finite type over a field K. An ...

An isolated singularity is a singularity for which there exists a (small) real number epsilon such that there are no other singularities within a neighborhood of radius ...

The fast Fourier transform (FFT) is a discrete Fourier transform algorithm which reduces the number of computations needed for N points from 2N^2 to 2NlgN, where lg is the ...

The nth subfactorial (also called the derangement number; Goulden and Jackson 1983, p. 48; Graham et al. 2003, p. 1050) is the number of permutations of n objects in which no ...

The set of all sets is its own power set. Therefore, the cardinal number of the set of all sets must be bigger than itself.