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Declaring real variables using Element


Hello to all!

I am trying to declare the variable S to be real, using the Element
command:
Element[S, Reals]

Next I calculate the complex conjugate of IS (I is the imaginary unit)
Conjugate[\[ImaginaryI] S]

The result I get is
-\[ImaginaryI] Conjugate[S]

 which should have been -IS. Why does it not recognise S as a real
variable?

I would appreciate any help.

Thanks,
Gideon


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