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{{r|Real number}}

...x-axis. The complex numbers left fixed by conjugation are precisely the [[real number]]s.

A real number that cannot be expressed as a fraction, m / n, in which m and n are integer

A real number and is the integer between 1 and -1, which signifies a value of nothing.

...-ary operator, indicating the number of arguments it takes. In the case of real number addition, the operator is [[binary operation|binary]] because it takes two

...> then the notation <math>f(t)=O(g(t))</math> indicates that there exist a real number ''T'' and a constant ''C'' such that <math>|f(t)|\leq C |g(t)|</math> for a ...solute value of another function, in that neigbourhood. For example, for a real number <math>t_0</math> the notation <math>f(t)=O(g(t-t_0))</math>, where ''g''('

Every cubic equation with [[real number]] [[coefficient]]s has at most three real roots, as dictated by the [[funda ...f a [[complex number]]. This is more difficult than finding the root of a real number, which is all that the quadratic formula requires. It is precisely this di

...|</math>. Then a set <math>A \subset X</math> is bounded if there exists a real number ''M'' > 0 such that <math>\|x\|\leq M</math> for all <math>x \in A</math>. Every bounded set of [[real number]]s has a [[supremum]] and an [[infimum]]. It follows that a [[monotonic seq

...n defined on the set of [[positive integer]]s, usually with [[integer]], [[real number|real]] or [[complex number|complex]] values.

Suppose ''f''(''x'') is a [[real-valued function]] and ''a'' is a [[real number]]. The expression ...nterval]] containing ''a'' (except possibly at ''a'') and let ''L'' be a [[real number]].

...] is itself invertible: over a [[field (mathematics)|field]] such as the [[real number|real]] or [[complex number]]s, this is equivalent to specifying that the de

{{r|Real number}}

a real number (with the decimal expansion 0.000...), and a complex number (0+0i).

...'d''=''b/a'' every rational or real number divides every other rational or real number.)

...n-commutative]] and [[Associative law|non-associative]] extension of the [[Real number|real numbers]]. They were were first discovered by John Graves, a friend of

{{r|Real number}}

{{r|Real number}}

{{r|Real number}}

{{r|Real number}}