Bayan da Euler ya ga aikin 1755 na Lagrange mai shekaru 19, Euler ya watsar da nasa tsarin lissafi na lissafi a madadin tsarin nazari na Lagrange kuma ya sake suna da lissafin lissafi a cikin darasinsa na 1756 Elementa Calculi Variationum.Legger (1834) (1885), Alfred Moritz (1848) (1885) (1885) ya rubuta wani muhimmin tsari, wanda ya biyo bayan matsalar brachistochrone curve wanda Johann Bernoulli (1696) ya gabatar (1696). Daga nan ne ya mamaye hankalin Jakob Bernoulli da Marquis de l'Hôpital, amma Leonhard Euler ya fara yin bayani game da batun, tun daga farkon 1733. Lagrange ya rinjayi aikin Euler don ba da gudummawa mai mahimmanci ga ka'idar. Bayan Euler ya ga aikin 1755 na Lagrange mai shekaru 19, Euler ya watsar da nasa tsarin lissafi na lissafi a madadin tsarin nazari na Lagrange kuma ya sake suna da lissafin lissafin lissafi a cikin darasinsa na 1756 Elementa Calculi Variationum.Legger (1886) (1885)), Alfred Moritz (18
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