Viscosity solutions to the degenerate ob
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P. Popivanov; N. Kutev
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Article
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2005
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John Wiley and Sons
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English
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## Abstract In this paper we prove a comparison principle between the semicontinuous viscosity subβ and supersolutions of the tangential oblique derivative problem and the mixed DirichletβNeumann problem for fully nonlinear elliptic equations. By means of the comparison principle, the existence of