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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.

The ordinal number of a value in a list arranged in a specified order (usually decreasing).

For a particular format in the IEEE 754-2008 framework, a subnormal number is a nonzero floating-point number with magnitude less than the magnitude of that formatÕs smallest ...

Subtraction is the operation of taking the difference d=x-y of two numbers x and y. Here, x is called the minuend, y is called the subtrahend, and the symbol between the x ...

A three-colorable graph G is a graph with chromatic number chi(G)<=3.

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

Let a knot K be n-embeddable. Then its tunnel number is a knot invariant which is related to n.

The number 1. There are n nth roots of unity, known as the de Moivre numbers.

F_mF_(n+1)-F_nF_(m+1)=(-1)^nF_(m-n), where F_n is a Fibonacci number.