<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="static/style.xsl"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2026-04-14T05:02:11Z</responseDate><request verb="GetRecord" identifier="oai:www.recercat.cat:2072/416171" metadataPrefix="oai_dc">https://recercat.cat/oai/request</request><GetRecord><record><header><identifier>oai:recercat.cat:2072/416171</identifier><datestamp>2026-04-08T04:06:56Z</datestamp><setSpec>com_2072_98</setSpec><setSpec>col_2072_378192</setSpec></header><metadata><oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:doc="http://www.lyncode.com/xoai" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
   <dc:title>Sobolev regularity of the Beurling transform on planar domains</dc:title>
   <dc:creator>Prats, Martí</dc:creator>
   <dc:subject>Quasiconformal mappings</dc:subject>
   <dc:subject>Sobolev spaces</dc:subject>
   <dc:subject>Lipschitz domains</dc:subject>
   <dc:subject>Beurling transform</dc:subject>
   <dc:subject>David-Semmes betas</dc:subject>
   <dc:subject>Peter Jones' betas</dc:subject>
   <dc:description>Consider a Lipschitz domain Ω and the Beurling transform of its characteristic function BχΩ(z) = -p.v. 1 πz2 ∗ χΩ(z). It is shown that if the outward unit normal vector N of the boundary of the domain is in the trace space of Wn,p(Ω) (i.e., the Besov space Bn-1/p p,p (∂Ω)) then BχΩ ∈ Wn,p(Ω). Moreover, when p.</dc:description>
   <dc:date>2017</dc:date>
   <dc:type>Article</dc:type>
   <dc:identifier>https://ddd.uab.cat/record/180442</dc:identifier>
   <dc:identifier>urn:10.5565/PUBLMAT6121701</dc:identifier>
   <dc:identifier>urn:oai:ddd.uab.cat:180442</dc:identifier>
   <dc:identifier>urn:oai:raco.cat:article/327583</dc:identifier>
   <dc:identifier>urn:articleid:20144350v61n2p291</dc:identifier>
   <dc:identifier>urn:scopus_id:85041047341</dc:identifier>
   <dc:identifier>urn:wos_id:000404842600001</dc:identifier>
   <dc:identifier>urn:altmetric_id:4281686</dc:identifier>
   <dc:identifier>urn:oai:egreta.uab.cat:publications/6afadef2-2b8c-403c-962d-e17240484790</dc:identifier>
   <dc:language>eng</dc:language>
   <dc:relation>Publicacions matemàtiques ; Vol. 61, Num. 2 (2017), p. 291-336</dc:relation>
   <dc:rights>open access</dc:rights>
   <dc:rights>Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.</dc:rights>
   <dc:rights>https://rightsstatements.org/vocab/InC/1.0/</dc:rights>
   <dc:format>application/pdf</dc:format>
   <dc:publisher/>
</oai_dc:dc></metadata></record></GetRecord></OAI-PMH>