Fundamental lemma of the calculus of variations (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Fundamental lemma of the calculus of variations" in English language version.

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illinois.edu

Liberzon 2012, Lemma 2.1 on p.30 Web version: "Lemma 2.1 The Lemma of DuBois-Reymond". Liberzon, Daniel (2012), Calculus of Variations and Optimal Control Theory, Princeton University Press
Liberzon 2012, Lemma 2.2 on p.33 Web version: "Lemma 2.2 (modification of Lemma 2.1)". Liberzon, Daniel (2012), Calculus of Variations and Optimal Control Theory, Princeton University Press