proof ch:14-calculus-of-variations@proof-20

open in the book · parts/02-mathematical-methods/14-calculus-of-variations.tex:1028

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proof : ch:14-calculus-of-variations@proof-20prooftheorem 16.36: Euler–Lagrange equations for several independent variables16.36equation 16.31: eq:calcvar-field-functional16.31lemma 16.18: Fundamental lemma16.18theorem 7.133: Gauss7.133definition 44.6: Stress–energy tensor44.6proposition 28.42: The wave equation of a stretched string28.42

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