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On a two-phase free...
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Lundström, Niklas L.P.1980-Umeå universitet,Institutionen för matematik och matematisk statistik
(author)
On a two-phase free boundary condition for p-harmonic measures
- Article/chapterEnglish2009
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2009-03-13
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Springer,2009
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:umu-31119
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-31119URI
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https://doi.org/10.1007/s00229-009-0257-4DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-163381URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Let Ωi⊂Rn,i∈{1,2} , be two (δ, r 0)-Reifenberg flat domains, for some 0<δ<δ^ and r 0 > 0, assume Ω1∩Ω2=∅ and that, for some w∈Rn and some 0 < r, w∈∂Ω1∩∂Ω2,∂Ω1∩B(w,2r)=∂Ω2∩B(w,2r) . Let p, 1 < p < ∞, be given and let u i , i∈{1,2} , denote a non-negative p-harmonic function in Ω i , assume that u i , i∈{1,2}, is continuous in Ω¯i∩B(w,2r) and that u i = 0 on ∂Ωi∩B(w,2r) . Extend u i to B(w, 2r) by defining ui≡0 on B(w,2r)∖Ωi. Then there exists a unique finite positive Borel measure μ i , i∈{1,2} , on R n , with support in ∂Ωi∩B(w,2r) , such that if ϕ∈C∞0(B(w,2r)) , then∫Rn|∇ui|p−2⟨∇ui,∇ϕ⟩dx=−∫Rnϕdμi.Let Δ(w,2r)=∂Ω1∩B(w,2r)=∂Ω2∩B(w,2r) . The main result proved in this paper is the following. Assume that μ 2 is absolutely continuous with respect to μ 1 on Δ(w, 2r), d μ 2 = kd μ 1 for μ 1-almost every point in Δ(w, 2r) and that logk∈VMO(Δ(w,r),μ1) . Then there exists δ~=δ~(p,n)>0 , δ~<δ^ , such that if δ≤δ~ , then Δ(w, r/2) is Reifenberg flat with vanishing constant. Moreover, the special case p = 2, i.e., the linear case and the corresponding problem for harmonic measures, has previously been studied in Kenig and Toro (J Reine Angew Math 596:1–44, 2006).
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Nyström, Kaj,1969-Uppsala universitet,Umeå universitet,Institutionen för matematik och matematisk statistik,Analys och tillämpad matematik(Swepub:uu)kanys227
(author)
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Umeå universitetInstitutionen för matematik och matematisk statistik
(creator_code:org_t)
Related titles
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In:Manuscripta mathematica: Springer129:2, s. 231-2490025-26111432-1785
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