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Mar 5, 2017 at 13:45 history edited Alexandre Eremenko CC BY-SA 3.0
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Mar 5, 2017 at 13:43 comment added Alexandre Eremenko Yes, but you can normalize it by setting $a_0=b_{M+1}=0$ and $f(1)=1)$, for example. This reduces the number of unknowns and equations.
Mar 5, 2017 at 12:26 comment added Stefano Thanks a lot! This is already quite useful. So the ansatz I should make is a function of the type $\omega(z)=\frac{a_0 + a_1 z + \cdots + a_{M+1} z^{M+1}}{1 + b_1 z + \cdots + b_{M+1} z^{M+1}}$, right?
Mar 5, 2017 at 12:21 vote accept Stefano
Mar 3, 2017 at 15:49 history answered Alexandre Eremenko CC BY-SA 3.0