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Fundamental Concepts 2. Additional Illustrations of the Invariant Imbedding Method 3. Functional Equations and Related Matters 4. Existence, Uniqueness, and Conservation Relations 5. Random Walk 6. Wave Propagation 7. Time-Dependent Problems 8. The Calculation of Eigenvalues for Sturm-Liouville Type Systems 9. Schrodinger-Like Equations 10. Applications to Equations with Periodic Coefficients 11. Transport Theory and Radiative Transfer 12. Integral Equations Author index Subject index.
Bellman et al. (Mon,) studied this question.