Re: sqrt(x^2) = x

*To*: mathgroup at smc.vnet.net*Subject*: [mg61189] Re: sqrt(x^2) = x*From*: "Francisco Javier" <pacoga at ctv.es>*Date*: Wed, 12 Oct 2005 01:42:23 -0400 (EDT)*References*: <difreg$fg6$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Francisco Javier a formulé ce martes : > Dear all, I am new in this group > > How can I tell Mathematica that I want to simplify all expressions like > Sqrt[x^2] as x, whithout taking into account that x is or not a > positive real number? > > Thank you very much Dear F.Jaccard and Ruth for your answers, but what I really mean has not a such simple solution. I want to "teach" to Mathematica that in next calculations Sqrt[x^2] is equivalent to x, I have tried Unprotect[Sqrt]; Sqrt[(x_)^2] := x; This seems works fine then with calculations like Sqrt[y^2] y but it fails with Sqrt[x^2 y^4] or even with Sqrt[x^2 y^4] Any ideas? -- ---- Francisco Javier García Capitán http://garciacapitan.auna.com