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Variational methods for second-order elliptic equations, Variational principle, Euler--Lagrange equation, Nonlinear elliptic equations, Optimality conditions for free problems in two or more independent variables, Elliptic Dirichlet problem, Duality method
Variational methods for second-order elliptic equations, Variational principle, Euler--Lagrange equation, Nonlinear elliptic equations, Optimality conditions for free problems in two or more independent variables, Elliptic Dirichlet problem, Duality method
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