Re: Problems with simplify and Sqrt[a^2]
- To: mathgroup at smc.vnet.net
- Subject: [mg73958] Re: Problems with simplify and Sqrt[a^2]
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Sat, 3 Mar 2007 01:22:38 -0500 (EST)
- Organization: Uni Leipzig
- References: <es907e$2b4$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi, a) Sqrt[v^2] is Abs[v] and not v b) FullSimplify[Sqrt[v^2],v>0 && Element[v,Reals]] will do it. Regards Jens 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 ? >