Abstract
The mathematical treatment of many problems in mathematical physics requires the minimization of a quadratic functional. It is shown that the optimizing function can be viewed as the solution of the familiar Euler equation, subject to boundary conditions, or as the solution of a certain Fredholm integral equation, or as the solution of an initial-value (Cauchy) problem. Each formulation has certain analytic and computational advantages and disadvantages.
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Kagiwada, H., Kalaba, R.E., Schumitzky, A. et al. Cauchy and Fredholm methods for Euler equations. J Optim Theory Appl 2, 157–163 (1968). https://doi.org/10.1007/BF00926997
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DOI: https://doi.org/10.1007/BF00926997