Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2007
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

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


  • Prev by Date: Re: Parse results from Solve
  • Next by Date: Re: Sort with -Infinity fails
  • Previous by thread: Re: Problems with simplify and Sqrt[a^2]
  • Next by thread: Re: Problems with simplify and Sqrt[a^2]