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Mathematica:How can I acclaim a variable is real in a complex function 
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#1
Feb1709, 10:31 PM

P: 2

Hi,I'm a beginner.
here's the example: f[x_] := E^(I*x) Conjugate[f[x]]*f[x] I'd like get 1,but it give me a complex function coz it regard x as complex. please help me:how to claim x is real? by the way,is that necessary to define a letter as a constant.no matter yes or not,how to refer a letter constant to be real or pure imaginary Thank you! 


#2
Feb1709, 11:47 PM

Sci Advisor
HW Helper
P: 3,684

You could do



#3
Feb1809, 07:00 AM

P: 2

Thanks for your reply.
I tried your answer,and it works. Well,I have some...eerr... what if I'd define the domain for function f[x]? I mean that I wanna prescribe x in f[x] must be real or pure imaginary or rational number.How to do that. I've a similar question here.How to claim a letter constant to be real or pure imaginary or rational number? Waiting for your kindness. 


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