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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
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