21. He also invented the calculus of variations including its best-known result, the Euler Lagrange equation. 22. Are mathematical results from the calculus of variations , which can also be used in mechanics. 23. He discovered his life's work, the calculus of variations , via the lecture notes of Bolza's teaching. 24. This relates the circle to a problem in the calculus of variations , namely the isoperimetric inequality. 25. Would it be reasonable, then, to start an article direct methods in the calculus of variations ? 26. The problem can be solved with the tools from the calculus of variations and optimal control. 27. Noether's theorem has become a fundamental tool of modern theoretical physics and the calculus of variations . 28. See calculus of variations and specifically Euler-Lagrange equations. 29. Their correspondence ultimately led to the calculus of variations , a term coined by Euler himself in 1766. 30. If one applies the calculus of variations to this, one again gets the equations for a geodesic.
