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Re: how to solve this problem?


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!
> 


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