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- W40564239 abstract "We explain in detail how to obtain the Kirillov vector fields (Lk)k∈Z on the space of univalent functions inside the unit disk. Following Kirillov, they can be produced from perturbations by vectors (eikθ)k∈Z of diffeomorphisms of the circle. We give a second approach to the construction of the vector fields. In our approach, the Lagrange series for the inverse function plays an important part. We relate the polynomial coefficients in these series to the polynomial coefficients in Kirillov vector fields. By investigation of degenerate cases, we look for the functions $$ f(z) = z + sumnolimits_{n geqslant 1} {a_n z^{n + 1} } $$ such that Lkf = L-k f for k ≥1. We find that f(z) must satisfy the differential equation: (*) $$ left[ {frac{{z^2 w}} {{1 - zw}} + frac{{zw}} {{w - z}}} right]f'(z) - f(z) - frac{{w^2 f'(w)^2 }} {{f(w)^2 }} times frac{{f(z)^2 }} {{f(w) - f(z)}} = 0. $$ We prove that the only solutions of (*) are Koebe functions. On the other hand, we show that the vector fields (T k )k∈Z image of the (Lk)k∈Z through the map $$ g(z) = frac{1} {{f(tfrac{1} {z})}} $$ can be obtained directly as the (Lk) from perturbations of diffeomorphisms of the circle." @default.
- W40564239 created "2016-06-24" @default.
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- W40564239 date "2009-01-01" @default.
- W40564239 modified "2023-10-16" @default.
- W40564239 title "From Diff (S 1) to Univalent Functions. Cases of Degeneracy" @default.
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- W40564239 doi "https://doi.org/10.1007/978-3-7643-9906-1_1" @default.
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