Content deleted Content added
m wrong syntax in short description |
→Even functions: grammar |
||
Line 14:
===Even functions===
[[Image:Function x^2.svg|right|thumb|<math>f(x)=x^2</math> is an example of an even function.]]
Let ''f'' be a real-valued function of a real variable. Then ''f'' is '''even''' if the following equation holds for all ''x'' such that ''x'' and −''x'' are in the domain of ''f'':<ref name=FunctionsAndGraphs>{{cite book|first1=I. M.|last1=Gel'Fand|author1-link=Israel Gelfand|first2=E. G.|last2=Glagoleva|author2-link=E. G. Glagoleva|first3=E. E.|last3=Shnol|title=Functions and Graphs|year=1990|publisher=Birkhäuser|isbn=0-8176-3532-7|url-access=registration|url=https://archive.org/details/functionsgraphs0000gelf}}</ref>{{rp|p. 11}}
{{Equation box 1
| |||