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ON LEAST SUPERSOLUTIONS FOR A PROBLEM WITH AN OBSTACLE

Mathematics of the USSR-Izvestiya, 1973
The existence of a least supersolution on a closed convex set of functions is proved for certain classes of quasilinear elliptic and parabolic equations. Such a least supersolution is a solution of a variational inequality.
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Convergence properties of supersolutions and -superharmonic functions

Nonlinear Analysis: Theory, Methods & Applications, 1997
Li Gongbao, O. Martio
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Classifying supersolutions

2013
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