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December  2006, 5(4): 709-731. doi: 10.3934/cpaa.2006.5.709

On the Dirichlet problem for non-totally degenerate fully nonlinear elliptic equations

1. 

Dipartimento di Matematica P. e A., Universita di Padova, via Belzoni 7, 35131 Padova

2. 

Dipartimento di Matematica Pura e Applicata, Università degli Studi di Padova, Via Belzoni, 7, 35131, Padova, Italy

Received  December 2005 Revised  April 2006 Published  September 2006

We prove some comparison principles for viscosity solutions of fully nonlinear degenerate elliptic equations that satisfy some conditions of partial non-degeneracy instead of the usual uniform ellipticity or strict monotonicity. These results are applied to the well-posedness of the Dirichlet problem under suitable conditions at the characteristic points of the boundary. The examples motivating the theory are operators of the form of sum of squares of vector fields plus a nonlinear first order Hamiltonian and the Pucci operator over the Heisenberg group.
Citation: Martino Bardi, Paola Mannucci. On the Dirichlet problem for non-totally degenerate fully nonlinear elliptic equations. Communications on Pure & Applied Analysis, 2006, 5 (4) : 709-731. doi: 10.3934/cpaa.2006.5.709
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