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Re: Mathematica help

• To: mathgroup at smc.vnet.net
• Subject: [mg75046] Re: Mathematica help
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Sun, 15 Apr 2007 05:10:38 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <evpnd6$5v1$1@smc.vnet.net>

Antal Miklós wrote:
> I would like to derive a complex function (containing complex integrals in
> trigonometrical functions) with respect to certain variables, and stipulate
> that those variables are real. Is such a stipulation possible?
> (Now I always get Im' ... and Re'... expressions, because Mathematica
> considers the variables complex.)
> 
> Thank you very much.
> 
> Sincerely yours,
> 
> Mikl=F3s Antal
> 

It would have been better if you had posted an example of the functions 
and the Mathematica command you are using.

You could start by checking Assuming [1, 2], Assumptions [3], Elements 
[4], and also the FAQ "How do I declare variables to have certain 
properties such as Real, Integer, or Positive?" [5].

Regards,
Jean-Marc

[1] http://documents.wolfram.com/mathematica/functions/Assuming

[2] _The Mathematica Book_, "3.3.11 Using Assumptions",
http://documents.wolfram.com/mathematica/book/section-3.3.11

[3] http://documents.wolfram.com/mathematica/functions/Assumptions

[4] http://documents.wolfram.com/mathematica/functions/Element

[5] 
http://support.wolfram.com/mathematica/mathematics/algebra/globaldeclarations.html