Editing Expression (mathematics) (section)

===Algebraic expression===
An ''[[algebraic expression]]'' is an expression built up from [[Algebraic number|algebraic constants]], [[Variable (mathematics)|variables]], and the [[algebraic operation]]s ([[addition]], [[subtraction]], [[multiplication]], [[Division (mathematics)|division]] and [[exponentiation]] by a [[rational number]]).<ref>{{cite book |last1=Morris |first1=Christopher G. |title=Academic Press dictionary of science and technology |publisher=Gulf Professional Publishing |page=[https://archive.org/details/academicpressdic00morr/page/74 74] |year=1992 |url=https://archive.org/details/academicpressdic00morr|url-access=registration |quote=algebraic expression over a field. }}</ref> For example, {{math|1=3''x''<sup>2</sup> − 2''xy'' + ''c''}} is an algebraic expression. Since taking the [[square root]] is the same as raising to the power {{sfrac|1|2}}, the following is also an algebraic expression:
:<math>\sqrt{\frac{1-x^2}{1+x^2}}</math>
See also: [[Algebraic equation]] and [[Algebraic closure]]