Geodesic
Error bound for a generalized M.\,A.~Lavrentiev's formula via the norm in a fractional Sobolev space
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 10 (2013), pp. 335-377

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We generalize M. A. Lavrentiev's approximate formula for the conformal mapping of the perturbed half-plane onto the half-plane. The generalization concerns harmonic functions and their derivatives in locally perturbed half-spaces (Lipschitz epigraphs). For both formulas, we obtain remainder estimates involving the square of the norm of the perturbing function in the fractional homogeneous Sobolev space $\dot{H}^{1/2}$. By the Kashin–Besov–Kolyada inequality, these estimates imply pointwise stability bounds in terms of the Lebesgue measure. Moreover, we prove the joint analyticity of the above-named harmonic functions with respect to the perturbing parameter and the space variables and justify a result on the interpolation between $L^1$ and homogeneous Slobodetskii spaces which is essentially due to A. Cohen.
Keywords: harmonic function, quantitative stability, remainder estimate.
Mots-clés : Lavrentiev formula, perturbed domain 
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     author = {A. I. Parfenov},
     title = {Error bound for a generalized {M.\,A.~Lavrentiev's} formula via the norm in a fractional {Sobolev} space},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {335--377},
     publisher = {mathdoc},
     volume = {10},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2013_10_a49/}
}
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A. I. Parfenov. Error bound for a generalized M.\,A.~Lavrentiev's formula via the norm in a fractional Sobolev space. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 10 (2013), pp. 335-377. http://geodesic.mathdoc.fr/item/SEMR_2013_10_a49/