Re: Re: can't MATHEMATICA simplify simple expressions?

*To*: mathgroup at smc.vnet.net*Subject*: [mg51570] Re: [mg51514] Re: can't MATHEMATICA simplify simple expressions?*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Sat, 23 Oct 2004 00:21:57 -0400 (EDT)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <cl4tg0$8g7$1@smc.vnet.net> <200410220220.WAA07117@smc.vnet.net>*Reply-to*: murray at math.umass.edu*Sender*: owner-wri-mathgroup at wolfram.com

But one should use PowerExpand with caution! As the HelpBrowser entry says: PowerExpand converts (a b)^c to a^c b^c, whatever the form of c is. PowerExpand also converts (a^b)^c to a^(b c), whatever the form of c is. The transformations made by PowerExpand are correct in general only if c is an integer or a and b are positive real numbers. Jens-Peer Kuska wrote: > Hi, > > a) because only for real vaules youn get a^3 > b) PowerExpand[(a^2)^(3/2) ] doesn what you want > > Regards > Jens > > "Cole Turner" <REMOVEcole.tuner at liwest.at> schrieb im Newsbeitrag > news:cl4tg0$8g7$1 at smc.vnet.net... > >>if I enter: >> >>FullSimplify [ (a^2)^(3/2) ] >> >>(in correct MATHEMATICA syntax, the program does not yield the correct >>result, a^3 ... >> >>why is that? -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**Re: can't MATHEMATICA simplify simple expressions?***From:*"Jens-Peer Kuska" <kuska@informatik.uni-leipzig.de>