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Geometric aspects of Sturm–Liouville problems III. Level surfaces of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si8.gif" overflow="scroll"><mml:mi>n</mml:mi></mml:math>th eigenvalue

Spectral TheoryGeometric Partial Differential EquationRiemann-hilbert ProblemGeometrySturm–liouville Problems IiiLevel SurfacesGeometric Aspects