Type: Article
Publication Date: 1987-01-01
Citations: 26
DOI: https://doi.org/10.1090/s0002-9947-1987-0879566-1
Viscosity solutions of Hamilton-Jacobi equations need only to be continuous. Here we prove that, in the special case of a one-dimensional stationary problem, under quite general assumptions, Lipschitz continuous viscosity solutions have right and left derivatives at every point. Moreover, these derivatives have some kind of continuity properties.