N'ime ihe ndị ọzọ Alfred Mornoulli (1885-1885) dere (1834-1885) na nsogbu nsogbu brachistochrone nke Johann Bernoulli welitere (1696). O weghaara uche nke Jakob Bernoulli na Marquis de l'Hôpital ozugbo, mana Leonhard Euler buru ụzọ kọwaa isiokwu ahụ, malite na 1733. Lagrange nwere mmetụta site na ọrụ Euler iji nye aka dị ukwuu na usoro iwu. Mgbe Euler hụrụ ọrụ 1755 nke Lagrange dị afọ iri na itoolu, Euler hapụrụ usoro geometric nke aka ya maka usoro nyocha nke Lagrange ma weghachite isiokwu nke Calculus of Newton na nkuzi ya nke 1756 Elementa Calculi Variation.
onye na-eme ihe dị mkpa