Re: Problems with simplify and Sqrt[a^2]

*To*: mathgroup at smc.vnet.net*Subject*: [mg73901] Re: Problems with simplify and Sqrt[a^2]*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Sat, 3 Mar 2007 00:51:46 -0500 (EST)*Organization*: The Open University, Milton Keynes, UK*References*: <es907e$2b4$1@smc.vnet.net>

dshortho wrote: > any help on this one: > > if you type in: > v3/Sqrt[v1^2]/Sqrt[v2^2] - v3/v1/v2 > > you get the same expression > > Even if you then type > Simplify[%] > > you still get the same expression > > I would have thought Mathematica would have resolved Sqrt[v1^2] to v1 (!?) > > Does anyone out there know why it does not do this, as it is causing some problems with some proofs I am doing ? > The following FAQ has the relevant information: "Why are transformations of Sqrt[x^2], Log[x y], Log[â??^x], etc. not automatically done?" http://support.wolfram.com/mathematica/mathematics/algebra/conditionalsimplification.html Regards, Jean-Marc