How to compute the norm of a complex number under square root? Does the square of norm equal the norm of square:
‖√z‖2=‖√z2‖?
Let z=reiθ, then ‖√z‖2=‖√reiθ‖2=‖√r√eiθ‖2=‖√re1/2iθ‖2=‖reiθ‖.
And
‖√z2‖=‖√(reiθ)2‖=‖√r2e2iθ‖=‖reiθ‖.
I hope this is correct? Thank you.
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