Gradient estimate in terms of a Hilbert-like distance, for minimal surfaces and Chaplygin gas
Abstract
We consider a quasilinear elliptic boundary value problem with homogenenous Dirich-let condition. The data is a convex planar domain. The gradient estimate is needed to ensure the uniform ellipticity, before applying regularity theory. We establish this estimate in terms of a distance which is equivalent to the Hilbert metric. This fills the proof of existence and uniqueness of a solution to this BVP, when the domain is only convex but not strictly, for instance if it is a polygon.
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