31-XX - Potential theory

31Axx - Two-dimensional theory

5	31A05	Harmonic, subharmonic, superharmonic functions
	31A10	Integral representations, integral operators, integral equations methods
3	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
1	31A35	Connections with differential equations
	31A99	None of the above, but in this section