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{{Maths rating |class=Start}}
== Definition of a linear function ==
A linear function ''f''(''x'') is said to be [[Linear_map|linear]] if and only if ''f''(''αx<sub>1</sup>''+''βx<sub>2</sup>'') = ''αf''(''x<sub>1</sup>'') + ''βf''(''x<sub>2</sup>'')
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