Re: Replacement Rule with Sqrt in denominator
- To: mathgroup at smc.vnet.net
- Subject: [mg114324] Re: Replacement Rule with Sqrt in denominator
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Wed, 1 Dec 2010 02:10:45 -0500 (EST)
It's not a bug (and not really a "feature", either): FullForm[1/Sqrt[x]] Power[x,Rational[-1,2]] Thus there is no "Sqrt[x] really in 1/Sqrt[x] (the latter being just a quick input form), just as there is no "I" in 1+2I. On 11/30/2010 4:05 AM, Richard Fateman wrote: > On 11/20/2010 3:11 AM, kj wrote: > >> >> I don't know a way to write the replacement rule so that it works >> for both Sqrt[x] and 1/Sqrt[x], but maybe someone else does. >> >> ~kj >> > See > www.cs.berkeley.edu/~fateman/papers/better-rules.pdf > > which describes how one can automatically produce rules that overcome > this bug in Mathematica. oops. I mean rules that overcome this > "feature" in Mathematica. > > RJF > > -- 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