It was in 1746, soon after becoming director of the Berlin Academy, that he first enunciated the Principle of Least Action and it was four years later that he published it in Essai de cosmologie.
Ito ay sa 1746, sa lalong madaling panahon pagkatapos ng pagiging direktor ng Berlin Academy, na siya unang enunciated ang Prinsipyo ng pinakakaunti Action at ito ay apat na taon sa susunod na siya nai-publish ito sa Essai de cosmologie.