# American Institute of Mathematical Sciences

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

 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 $Ω$.
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 - A, 2013, 33 (5) : 1809-1818. doi: 10.3934/dcds.2013.33.1809
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##### References:
 [1] Colin Bennett and Robert Sharpley, "Interpolation of Operators,", Pure and Applied Mathematics, 129 (1988).   Google Scholar [2] Marie-Francoise Bidaut-Véron and Laurent Vivier, An elliptic semilinear equation with source term involving boundary measures: the subcritical case,, Rev. Mat. Iberoamericana, 16 (2000), 477.  doi: 10.4171/RMI/281.  Google Scholar [3] Haïm Brezis, "Analyse Fonctionnelle,", [Functional analysis] Théorie et applications. [Theory and applications] Collection Mathématiques Appliquées. pour la Maîtrise. [Collection of Applied Mathematics for the Master's Degree] Masson, (1983).   Google Scholar [4] Haïm Brezis, Thierry Cazenave, Yvan Martel and Arthur Ramiandrisoa, Blow up for $u_t-\Delta u=g(u)$ revisited,, Adv. Differential Equations, 1 (1996), 73.   Google Scholar [5] J. I. Díaz and J. M. Rakotoson, On the differentiability of very weak solutions with right-hand side data integrable with respect to the distance to the boundary,, J. Funct. Anal., 257 (2009), 807.  doi: 10.1016/j.jfa.2009.03.002.  Google Scholar [6] Jesus Idelfonso Díaz and Jean Michel Rakotoson, On very weak solutions of semi-linear elliptic equations in the framework of weighted spaces with respect to the distance to the boundary,, Discrete Contin. Dyn. Syst., 27 (2010), 1037.  doi: 10.3934/dcds.2010.27.1037.  Google Scholar [7] Françoise Demengel and Gilbert Demengel, "Espaces Fonctionnels,", (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, (2007).   Google Scholar [8] David Gilbarg and Neil S. Trudinger, "Elliptic Partial Differential Equations of Second Order,", Reprint of the 1998 edition. Classics in Mathematics. Springer-Verlag, (1998).   Google Scholar [9] J. M. Rakotoson, A few natural extension of the regularity of a very weak solution,, Differential and Integral Equations, 24 (2011), 1125.   Google Scholar [10] Jean-Michel Rakotoson, "Réarrangement Relatif,", (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], (2008).   Google Scholar [11] Jean-Émile Rakotoson and Jean-Michel Rakotoson, "Analyse Fonctionnelle Appliquée aux Équations aux Dérivées Partielles,", [Functional analysis applied to partial differential equations] Mathématiques. [Mathematics] Presses Universitaires de France, (1999).   Google Scholar
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