Geodesic
Winding numbers and Fourier series
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Modern problems of mathematics, Tome 273 (2011), pp. 207-211

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This is an expository paper on a topic of classical analysis arising from the BMO-theory of topological degree (Brezis–Nirenberg, 1995). We sketch the history of the subject and some of its recent developments. 
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     author = {Jean-Pierre Kahane},
     title = {Winding numbers and {Fourier} series},
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     publisher = {mathdoc},
     volume = {273},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_273_a7/}
}
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Jean-Pierre Kahane. Winding numbers and Fourier series. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Modern problems of mathematics, Tome 273 (2011), pp. 207-211. http://geodesic.mathdoc.fr/item/TM_2011_273_a7/