Phragmén--Lindelöf theorem for infinity harmonic functions

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January 2015, 14(1): 127-132. doi: 10.3934/cpaa.2015.14.127

Phragmén--Lindelöf theorem for infinity harmonic functions

1.	University of Helsinki, Department of Mathematics and Statistics, P.O. Box 68, FI-00014 University of Helsinki, Finland, Finland

Received October 2013 Revised January 2014 Published September 2014

Abstract
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We investigate a version of the Phragmén--Lindelöf theorem for solutions of the equation $\Delta_\infty u=0$ in unbounded convex domains. The method of proof is to consider this infinity harmonic equation as the limit of the $p$-harmonic equation when $p$ tends to $\infty$.

Keywords: $p$-Laplace equation, $p$-harmonic equation, Growth estimate, infinity harmonic, Phragmén--Lindelöf principle, $p$-Laplacian..

Mathematics Subject Classification: Primary: 35B40; Secondary: 35J7.

Citation: Seppo Granlund, Niko Marola. Phragmén--Lindelöf theorem for infinity harmonic functions. Communications on Pure & Applied Analysis, 2015, 14 (1) : 127-132. doi: 10.3934/cpaa.2015.14.127

References:

[1]	G. Aronsson, On the partial differential equation $u_x^{2}u_{xx} +2u_xu_yu_{xy}+u_y^{2}u_{yy}=0$,, \emph{Ark. Mat.}, 7 (1968), 395. Google Scholar
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[7]	S. Granlund, P. Lindqvist and O. Martio, Phragmén-Lindelöf's and Lindelöf's theorems,, \emph{Ark. Mat.}, 23 (1985), 103. doi: 10.1007/BF02384420. Google Scholar
[8]	R. Jensen, Uniqueness of Lipschitz extensions: minimizing the sup norm of the gradient,, \emph{Arch. Rational Mech. Anal.}, 123 (1993), 51. doi: 10.1007/BF00386368. Google Scholar
[9]	Z. Jin and K. Lancaster, Theorems of Phragmén-Lindelöf type for quasilinear elliptic equations,, \emph{J. Reine Angew. Math.}, 514 (1999), 165. doi: 10.1515/crll.1999.070. Google Scholar
[10]	P. Lindqvist, On the growth of the solutions of the differential equation div$(\|\nabla u\|^{p-2}\nabla u)=0$ in $n$-dimensional space,, \emph{J. Differential Equations}, 58 (1985), 307. doi: 10.1016/0022-0396(85)90002-6. Google Scholar
[11]	P. Lindqvist and J. Manfredi, The Harnack inequality for $\infty$-harmonic functions,, \emph{Electron. J. Differential Equations}, 4 (1995), 1. Google Scholar
[12]	E. Phragmén and E. Lindelöf, Sur une extension d'un principe classique de l'analyse et sur quelques propriétés des fonctions monogénes dans le voisinage d'un point singulier,, \emph{Acta Math.}, 31 (1908), 381. doi: 10.1007/BF02415450. Google Scholar

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References:

[1]	G. Aronsson, On the partial differential equation $u_x^{2}u_{xx} +2u_xu_yu_{xy}+u_y^{2}u_{yy}=0$,, \emph{Ark. Mat.}, 7 (1968), 395. Google Scholar
[2]	G. Aronsson, M. G. Crandall and P. Juutinen, A tour of the theory of absolutely minimizing functions,, \emph{Bull. Amer. Math. Soc. (N.S.)}, 41 (2004), 439. doi: 10.1090/S0273-0979-04-01035-3. Google Scholar
[3]	T. Bhattacharya, On the behaviour of $\infty$-harmonic functions on some special unbounded domains,, \emph{Pacific J. Math.}, 219 (2005), 237. doi: 10.2140/pjm.2005.219.237. Google Scholar
[4]	T. Bhattacharya, A note on non-negative singular infinity-harmonic functions in the half-space,, \emph{Rev. Mat. Complut.}, 18 (2005), 377. Google Scholar
[5]	T. Bhattacharya, E. DiBenedetto and J. Manfredi, Limits as $p\to\infty$ of $\Delta_pu_p=f$ and related extremal problems,, \emph{Rend. Sem. Mat. Univ. Politec. Torino}, (1989), 15. Google Scholar
[6]	I. Capuzzo Dolcetta and A. Vitolo, A qualitative Phragmén-Lindelöf theorem for fully nonlinear elliptic equations,, \emph{J. Differential Equations}, 243 (2007), 578. doi: 10.1016/j.jde.2007.08.001. Google Scholar
[7]	S. Granlund, P. Lindqvist and O. Martio, Phragmén-Lindelöf's and Lindelöf's theorems,, \emph{Ark. Mat.}, 23 (1985), 103. doi: 10.1007/BF02384420. Google Scholar
[8]	R. Jensen, Uniqueness of Lipschitz extensions: minimizing the sup norm of the gradient,, \emph{Arch. Rational Mech. Anal.}, 123 (1993), 51. doi: 10.1007/BF00386368. Google Scholar
[9]	Z. Jin and K. Lancaster, Theorems of Phragmén-Lindelöf type for quasilinear elliptic equations,, \emph{J. Reine Angew. Math.}, 514 (1999), 165. doi: 10.1515/crll.1999.070. Google Scholar
[10]	P. Lindqvist, On the growth of the solutions of the differential equation div$(\|\nabla u\|^{p-2}\nabla u)=0$ in $n$-dimensional space,, \emph{J. Differential Equations}, 58 (1985), 307. doi: 10.1016/0022-0396(85)90002-6. Google Scholar
[11]	P. Lindqvist and J. Manfredi, The Harnack inequality for $\infty$-harmonic functions,, \emph{Electron. J. Differential Equations}, 4 (1995), 1. Google Scholar
[12]	E. Phragmén and E. Lindelöf, Sur une extension d'un principe classique de l'analyse et sur quelques propriétés des fonctions monogénes dans le voisinage d'un point singulier,, \emph{Acta Math.}, 31 (1908), 381. doi: 10.1007/BF02415450. Google Scholar

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