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 MiklÃ³s 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