Re: how to solve this problem?

*To*: mathgroup at smc.vnet.net*Subject*: [mg95106] Re: how to solve this problem?*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Tue, 6 Jan 2009 04:13:43 -0500 (EST)*Organization*: Uni Leipzig*References*: <gjsg76$juc$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de

Hi, and Element[{x,y},Reals] and With[{z = x + I*y}, FullSimplify[{Re[z], Im[z]}, Element[{x, y}, Reals]] ] is more complicated ? Regards Jens Ising wrote: > Hi: > I want to define the variables x and y are real at first,then: > z=x+I*y; > Re[z]=x > Im[z]=y > Using "Assumptions" "Assuming"? But i don not know how to use it. Is > there other ways to get that? > I know in another system, it is easy, as in > assume(x,real,y,real); > So what is in Mathematica? > Thanks! >