MathGroup Archive 2000

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

Search the Archive

Re: global real variables

  • To: mathgroup at
  • Subject: [mg22039] Re: global real variables
  • From: Jens-Peer Kuska <kuska at>
  • Date: Fri, 11 Feb 2000 02:38:20 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <87trds$>
  • Sender: owner-wri-mathgroup at


my Mathematica 4.0.1 reply for

FullSimplify[Conjugate[x + x*p^-1], Element[{x, p}, Reals]]

(1 + p^(-1))*x

But I agree that the Element relation should be an attribute to
a symbol. The best thing is to make a global variable
$mydomains={Element[{x,p},Reals] && Element[{i,j,k},Integers]}

and use


during your calculation. Manly to avoid that you simplify with
the assumption x is real and two steps later you forgot this.

Hope that helps

>     Say I have tow var.s, x and p.  Both are real so I can do this.
> Simplify[ Conjugate[ x ] , Element[ x , Reals ] ]  ----> x
> amd I get the same thing for p, but it stops working if I have functions of
> x and p, for instance I get
> Simplify[ Conjugate[ x + x * p^-1 ] , Element[ {x,p} , Reals ] ]  ---->
>  Conjugate[ x + x * p^-1 ]
> It works if I use FullSimplify   AND   put p^-1 into the list of variables
> that I want to have real.  How can I get around this without listing every
> negative power of every variable and wasting time with FullSimplify.  Thanks
> for any help.  Thanks.
>                 -NAUM

  • Prev by Date: Re: missing greek letters in ISO 8859-7
  • Next by Date: Re: ASCII Exportation of InterpolatingFunction
  • Previous by thread: global real variables
  • Next by thread: Re: global real variables