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MathGroup Archive 2005

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Re: how to set a global assumption setting Every Varaible I use is Real?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55096] Re: [mg55056] how to set a global assumption setting Every Varaible I use is Real?
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Sat, 12 Mar 2005 02:36:44 -0500 (EST)
  • References: <200503110920.EAA02123@smc.vnet.net>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

you could set up a pattern that fits every symbol in the global
context and say that all variables fitting the pattern are elements of
the real numbers

you could assign that statement to a variable in another context and
redefine whatever functions you want to take the assumption into
account (probably simplify and full simplify)


On Fri, 11 Mar 2005 04:20:31 -0500 (EST), foice
<foice@n0nspammar&tiscali.it> wrote:
> i'm dealing with simple trig funcions, Sin[], Cos[] and so on ...
> 'm also using Conjugate and my expressions are full of
> Cos[a]*
> Now if a is real there's no risk to have Complex number.
> I have may variables, and I would like to avoid a redefinition of
> $Assuming where I have to list every varaible I use. I prefer, if
> exists, somethig like:
> "Dear Mathematica 5.1,
>         every variable I use is Real, wathever its name is ...
> If I'll need complex number I'll use :ii: to enter the imaginary unit.
> See you at next calculation.
> Regards
> Your faithfull User."
> 
> Is it possible?
> 
> 


-- 
Chris Chiasson
Kettering University
Mechanical Engineering
Graduate Student
1 810 265 3161


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