Home›Calculus of variations›ベルトラミ恒等式🌐日本語English中文日本語EntityQ3303275· pop 5· linked from 9 articlesベルトラミ恒等式special case of the Euler-Lagrange equationAvailable in 5 languages中文AlbanianCatalanDanishvia Wikidata sitelinks · CC0Connectionslist of differentiation rulesEntitydifferentialEntityCategoriesCalculus of variationsOptimal control