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Re: Simplifying things

  • To: mathgroup at
  • Subject: [mg26117] Re: Simplifying things
  • From: "Paul Lutus" <nospam at>
  • Date: Tue, 28 Nov 2000 01:56:03 -0500 (EST)
  • References: <8vfs3v$>
  • Sender: owner-wri-mathgroup at

<djago at> wrote in message news:8vfs3v$jkq at
> Hi!
> I need to simplify looooong equations, but don't know how to get rid of
> those terms like:
> Sqrt[a^2]
> when a is a real positive variable... How can I tell Mathematica 3 to
> simplify this?

I ran into this recently also. It turns out that versions of Mathematica
before version 4.0 could not be instructed to make the necessary assumptions
about such an equation (say, that x >= 0).

In Mathematica 4.0, you can say --

Simplify[Sqrt[x^2],x >= 0]

-- and you will get the desired result.

Here is a link to a more complete explanation. Remember, some of the
examples shown don't work in pre-4.0 versions:


Paul Lutus

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