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I have a unitary Matrix which consists of Complex coefficients like A, B C etc I want to have a complex repres. For A like A = a0* Exp (i Phi) and saying that a0 is real and positiv. I tried the Assumption option but everytime it doesn't work when i try to look at ComplexConj(A) * A - i alwayd get sth like a0 * Conjugate a0 but it should be a0^2.

Can you please help me?

Hrm
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    try using `Simplify` with assumptions: https://reference.wolfram.com/language/ref/Simplify.html – Tofi Sep 10 '19 at 08:44
  • Thanks - Ok then i would have sth like A = Simplify[a0*Exp(iphi), Element[a0, Reals]] this should work? – Hrm Sep 10 '19 at 09:19
  • Well you can try it. I cannot verify because I do not have Mathematica right now – Tofi Sep 10 '19 at 10:16

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