The modern theory of viscosity solutions was developed by Crandall, Evans, Jensen, Ishii, Lions, and others. First, it was designed for first order equations. Later, it was extended to second order equations. The solutions must obey a Comparison Principle.
CITATION STYLE
Lindqvist, P. (2019). Viscosity Solutions. In SpringerBriefs in Mathematics (pp. 77–85). Springer Science and Business Media B.V. https://doi.org/10.1007/978-3-030-14501-9_9
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