Methodus Inveniendi Lineas Curvas Maximi Minimive proprietate gaudentes. sive Solutio Problematis Isoperimetrici Latissimo Sensu Accepti.
Lausanne & Geneva: Apud Marcum-Michaelem Bousquet & Socios. 1744. Full Description: EULER, Leonhard. Methodus inveniendi lineas curvas maximi minimive proprietate gaudentes, sive Solutio problematis isoperimetrici latissimo sensu accepti. Lausanne: Apud Marcum-Michaelem Bousquet & Socios., 1744. First edition of Euler’s most valuable contribution to mathematics, in which he developed the concept.....