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On the regularity of solutions to elliptic differential inequalities. (English) Zbl 0482.35018
Mathematical techniques of optimization, control and decision, Ann. CEREMADE 1, 91-109 (1981).

35B65 Smoothness and regularity of solutions to PDEs
35R45 Partial differential inequalities and systems of partial differential inequalities
35J60 Nonlinear elliptic equations
35J15 Second-order elliptic equations
49J40 Variational inequalities