Columbia subject headings:
Boundary value problems--Improperly posed problems.
Mathematical physics.
Numerical analysis--Improperly posed problems.
Harvard subject headings:
Boundary value problems--Improperly posed problems.
Mathematical physics.
Numerical analysis--Improperly posed problems.
Princeton subject headings:
Boundary value problems--Improperly posed problems.
Mathematical physics.
Numerical analysis--Improperly posed problems.