Columbia subject headings:
Differential equations, Elliptic--Numerical solutions.
Eigenfunctions.
Schrödinger operator.
Harvard subject headings:
Differential equations, Elliptic--Numerical solutions.
Eigenfunctions.
Schrödinger operator.
Princeton subject headings:
Differential equations, Elliptic--Numerical solutions.
Eigenfunctions.
Schrödinger operator.