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

*To*: mathgroup at smc.vnet.net*Subject*: [mg55056] how to set a global assumption setting Every Varaible I use is Real?*From*: foice <foice@N0NSPAMMAR&tiscali.it>*Date*: Fri, 11 Mar 2005 04:20:31 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

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?

**Follow-Ups**:**Re: how to set a global assumption setting Every Varaible I use is Real?***From:*Chris Chiasson <chris.chiasson@gmail.com>

**Re: how to set a global assumption setting Every Varaible I use is Real?***From:*Chris Chiasson <chris.chiasson@gmail.com>