35Jxx Partial differential equations of elliptic type [See also 58Jxx, ]

• 35J05 Laplace equation, reduced wave equation (Helmholtz), Poisson equation
  
• 35J25 Boundary value problems for second-order, elliptic equations
  
• 35J65 Nonlinear boundary value problems for linear elliptic PDE; boundary value problems for nonlinear elliptic PDE
  
• 35J70 Elliptic partial differential equations of degenerate type