## Andrei V. Kazantsev

## On a problem of Polya and Szego

## (Lobachevskii Journal of Mathematics, Vol.9, pp.37-46)

We give a new proof of a theorem, which is originally due to Gehring
and Pommerenke on the triviality of the extrema set $M_f$ of the inner
mapping radius $|f'(\zeta)|(1-|\zeta|^2)$ over the unit disk in the
plane, where the Riemann mapping function $f$ satisfies the well-known
Nehari univalence criterion. Our main tool is the local bifurcation
research of $M_f$ for the level set parametrization
$f_r(\zeta)=f(r\zeta), r>0$.

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