Eigenvalues of regular Sturm-Liouville problems

@inproceedings{Kong1996EigenvaluesOR,
  title={Eigenvalues of regular Sturm-Liouville problems},
  author={Qingkai Kong and Anton Zettl},
  year={1996}
}
The eigenvalues of Sturm-Liouville (SL) problems depend not only continuously but smoothly on the problem. An expression for the derivative of the n-th eigenvalue with respect to a given parameter: an endpoint, a boundary condition constant, a coefficient or weight function, is found. 
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