Abstract
The modern theory of viscosity solutions, created by Lions, Crandall, Evans, Ishii, Jensen, and others, relies on the appropriately defined viscosity supersolutions, which are merely lower semicontinuous functions by their definition. For second order equations, these are often the same functions as those supersolutions that are encountered in potential theory.
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Lindqvist, P. (2012). Regularity of Supersolutions. In: Regularity Estimates for Nonlinear Elliptic and Parabolic Problems. Lecture Notes in Mathematics(), vol 2045. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27145-8_2
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