Appendix E: Eigenfunctions and Eigenvalues of the Schrödinger Equation and Sturm’s Comparison Theorem

On page 285, line 15, equation is incorrectly presented as: \( \lambda<\mathop{{\lim }}\limits_{{x \to \pm \infty }} \kappa (x) \)

The correct version is: \( \lambda<\mathop{{\lim }}\limits_{{x \to \pm \infty }} u (x) \)

On page 285, line 17, equation is incorrectly presented as: \( \lambda>\mathop{{\lim }}\limits_{{x \to \pm \infty }} \kappa (x) \)

The correct version is: \( \lambda>\mathop{{\lim }}\limits_{{x \to \pm \infty }} u (x) \)