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i need a proof for the diedonne criterion on univalent polynomials.

i was wondering if anyone knows a book or reference where i can find it.

it says:

polyn. of degree n is univalent in the open disk iff sum(k=1 --> n) a_k sin(kt)/sint z^(k-1)

is not 0 in open unit disk, given 0 < t < pi/2

thank you

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# Dieudonne criterion

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