31Axx Two-dimensional theory

• 31A05 Harmonic, subharmonic, superharmonic functions
• 31A10 Integral representations, integral operators, integral equations methods
• 31A15 Potentials and capacity, harmonic measure, extremal length, See also {30C85}
• 31A20 Boundary behavior (theorems of Fatou type, etc.)
• 31A25 Boundary value and inverse problems
• 31A30 Biharmonic, polyharmonic functions and equations, Poisson's equation
• 31A35 Connections with differential equations
• 31A99 None of the above but in this section