Re: real variable
- To: mathgroup at smc.vnet.net
- Subject: [mg32255] Re: real variable
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Wed, 9 Jan 2002 23:37:09 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <a1gu9k$mu8$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, Simplify[yourExpression,Element[x,Reals]] ? Or the good old hard way Unprotect /@ {Re, Im} Re[a_.*x] := x*Re[a] Im[a_.*x] := 0 Protect /@ {Re, Im} x /: Arg[x] := 0 Regards Jens Nikolay Andreev wrote: > > Dear Mathgroup! > > How could one explain to Mathematica that variable x will be real during > all the session, so if somewhere appear Conjugate[x] then this must be x, > and Re[x+I*x] is x? > > Thank you, > Nikolay > ------------------------------------------------ > Nikolay N. Andreev > Russia, 117966, GSP-1, Moscow, Gubkina 8. > Steklov Institute of Mathematics > Dep. of Function Theory > E-mail: andreev at mccme.ru > Home page: http://www.mi.ras.ru/~andreev > ------------------------------------------------