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Concerning fractional powers the image used to illustrate the rule is erroneous p07419010.png

The rule should be stated as : a^(n/m) = (a^(1/m))^n rather than this : a^(n/m) = (a^(1/n))^m

Indeed! Thank you for pointing it.
And please sign your remarks with four tildas: ~~~~. :-)
--Boris Tsirelson (talk) 20:54, 7 February 2013 (CET)
Fixed. --Ulf Rehmann 23:40, 7 February 2013 (CET)
How to Cite This Entry:
Power. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Power&oldid=29405