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=== Number line === {{main|Number line}} [[File:Number line with x smaller than y.svg|alt=see caption|thumb|A number line, with variable x on the left and y on the right. Therefore, x is smaller than y.]] A point on number line corresponds to a [[real number]] and vice versa.<ref>{{cite book |last1=Stewart |first1=James B. |title=College Algebra |last2=Redlin |first2=Lothar |last3=Watson |first3=Saleem |publisher=[[Brooks Cole]] |year=2008 |isbn=978-0-495-56521-5 |edition=5th |pages=13β19 |authorlink=James Stewart (mathematician)}}</ref> Usually, [[integer]]s are evenly spaced on the line, with positive numbers are on the right, negative numbers on the left. As an extension to the concept, an [[Imaginary line (mathematics)|imaginary line]] representing [[imaginary number]]s can be drawn perpendicular to the number line at zero.<ref>{{citation |last=Patterson |first=B. C. |title=The inversive plane |journal=The American Mathematical Monthly |volume=48 |pages=589β599 |year=1941 |issue=9 |doi=10.2307/2303867 |jstor=2303867 |mr=0006034 |authorlink=Boyd Patterson}}</ref> The two lines forms the [[complex plane]], a geometrical representation of the set of [[complex number]]s.
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