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

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

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

A very large number defined in terms of circle notation by Steinhaus (1983) as .

A number theoretic function is a function whose domain is the set of positive integers.

Any prime number other than 2 (which is the unique even prime). Humorously, 2 is therefore the "oddest" prime.

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 ...

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.