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A family of subsets of a topological space such that every point has a neighborhood which intersects only a finite number of them.

The number of outward directed graph edges from a given graph vertex in a directed graph.

The polynomial giving the number of colorings with m colors of a structure defined by a permutation group.

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 ...

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 period for a quasiperiodic trajectory to pass through the same point in a surface of section. If the rotation number is irrational, the trajectory will densely fill out a ...

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

A system is singular if its condition number is infinite and ill-conditioned if it is too large.

The word "spectrum" confusingly has a number of unrelated meanings in various branches of mathematics.