{ "id": "1410.8478", "version": "v1", "published": "2014-10-30T18:11:29.000Z", "updated": "2014-10-30T18:11:29.000Z", "title": "Muckenhoupt weights and Lindelöf theorem for harmonic mappings", "authors": [ "David Kalaj" ], "comment": "18 pages", "categories": [ "math.CV" ], "abstract": "We extend the result of Lavrentiev which asserts that the harmonic measure and the arc-length measure are $A_\\infty$ equivalent in a chord-arc Jordan domain. By using this result we extend the classical result of Lindel\\\"of to the class of quasiconformal (q.c.) harmonic mappings by proving the following assertion. Assume that $f$ is a quasiconformal harmonic mapping of the unit disk $\\mathbf{U}$ onto a Jordan domain. Then the function $A(z)=\\arg(\\partial_\\varphi(f(z))/z)$ where $z=re^{i\\varphi}$, is well-defined and smooth in $\\mathbf{U}^*=\\{z: 0<|z|<1\\}$ and has a continuous extension to the boundary of the unit disk if and only if the image domain has $C^1$ boundary.", "revisions": [ { "version": "v1", "updated": "2014-10-30T18:11:29.000Z" } ], "analyses": { "keywords": [ "harmonic mapping", "lindelöf theorem", "muckenhoupt weights", "unit disk", "chord-arc jordan domain" ], "note": { "typesetting": "TeX", "pages": 18, "language": "en", "license": "arXiv", "status": "editable", "adsabs": "2014arXiv1410.8478K" } } }