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May  2013, 33(5): 1809-1818. doi: 10.3934/dcds.2013.33.1809

Gradient blow-up in Zygmund spaces for the very weak solution of a linear elliptic equation

Frédéric Abergel 1, and  Jean-Michel Rakotoson 2,

1. 

Laboratoire de Mathématiques Appliquées aux Systémes, École Centrale Paris Grande voie des Vignes, 92295 Châtenay-Malabry Cedex, France
2. 

UMR 6086 CNRS. Laboratoire de Mathématiques - Université de Poitiers - SP2MI, Boulevard Marie et Pierre Curie, Téléport 2, BP30179 - 86962 Futuroscope Chasseneuil Cedex

Received  December 2011 Revised  February 2012 Published  December 2012

It is known that the very weak solution of $-∫_Ω u\Deltaφ dx=∫_Ω fφ dx$, $∀φ∈ C^2(\overline{Ω}),$ $φ=0$ on $∂Ω$, $u\in L^1(Ω)$ has its gradient in $Ł^1(Ω)$ whenever $f∈ L^1(Ω;δ(1+|Lnδ|))$, $δ(x)$ being the distance of $x∈Ω$ to the boundary. In this paper, we show that if $f≥0$ is not in this weighted space $L^1(Ω;δ(1+|Lnδ|))$, then its gradient blows up in $L(\log L)$ at least. Moreover, we show that there exist a domain $Ω$ of class $C^\infty$ and a function $f∈ L^1_+(Ω,δ)$ such that the associated very weak solution has its gradient being non integrable on $Ω$.
Keywords: monotone rearrangement, distance to the boundary, gradient blow-up., Very weak solutions, linear PDE, regularity.
Mathematics Subject Classification: 35B44, 35A01, 35J67, 35J2.
Citation: Frédéric Abergel, Jean-Michel Rakotoson. Gradient blow-up in Zygmund spaces for the very weak solution of a linear elliptic equation. Discrete & Continuous Dynamical Systems, 2013, 33 (5) : 1809-1818. doi: 10.3934/dcds.2013.33.1809
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(French. French summary) [Relative rearrangement] Un instrument d'estimations dans les problèmes aux limites. [An estimation tool for limit problems] Mathématiques & Applications (Berlin) [Mathematics & Applications], 64. Springer, Berlin, 2008. xvi+293 pp. Google Scholar

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show all references

References:
[1]

Pure and Applied Mathematics, 129. Academic Press, Inc., Boston, MA, 1988. xiv+469 pp.  Google Scholar

[2]

Rev. Mat. Iberoamericana, 16 (2000), 477-513. doi: 10.4171/RMI/281.  Google Scholar

[3]

[Functional analysis] Théorie et applications. [Theory and applications] Collection Mathématiques Appliquées. pour la Maîtrise. [Collection of Applied Mathematics for the Master's Degree] Masson, Paris, 1983. xiv+234 pp. Google Scholar

[4]

Adv. Differential Equations, 1 (1996), 73-90.  Google Scholar

[5]

J. Funct. Anal., 257 (2009), 807-831. doi: 10.1016/j.jfa.2009.03.002.  Google Scholar

[6]

Discrete Contin. Dyn. Syst., 27 (2010), 1037-1058. doi: 10.3934/dcds.2010.27.1037.  Google Scholar

[7]

(French) [Functional spaces] Utilisation dans la résolution des équations aux dérivées partielles. [Application to the solution of partial differential equations] Savoirs Actuels (Les Ulis). [Current Scholarship (Les Ulis)] EDP Sciences, Les Ulis; CNRS Éditions, Paris, 2007. xii+467 pp. Google Scholar

[8]

Reprint of the 1998 edition. Classics in Mathematics. Springer-Verlag, Berlin, 2001. xiv+517 pp.  Google Scholar

[9]

Differential and Integral Equations, 24 (2011), 1125-1140.  Google Scholar

[10]

(French. French summary) [Relative rearrangement] Un instrument d'estimations dans les problèmes aux limites. [An estimation tool for limit problems] Mathématiques & Applications (Berlin) [Mathematics & Applications], 64. Springer, Berlin, 2008. xvi+293 pp. Google Scholar

[11]

[Functional analysis applied to partial differential equations] Mathématiques. [Mathematics] Presses Universitaires de France, Paris, 1999. 232 pp. Google Scholar

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