Could an integral whose both limits, or one, are infinite be optimized using the Euler-Lagrange equation? (Any resource on the matter is appreciated) $$\int_{-\infty}^{+\infty}\mathcal{L}(x,f(x),f'(x))\,dx$$
2026-04-13 10:11:28.1776075088
Integral and Euler-Lagrange equation
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