Lecture 17. Calculus Of Variations. Euler-Lagrange Equation (Classical Mechanics).

[g-abeshawel]

thank you so much the calmness and the clarity of the lecture i loved it

[johnbest]

Great lecture thanks. Clearest I've seen.

[hosseinnasiri]

Thanks a lot !! a very detailed and clear lecture!

[markgoretsky]

A couple of comments/recommendations for Andriy. 1) To save time, the Leibniz Rule for constant limits of integration could be used instead of variable limits. 2) Important fact that was not explained in your presentation is that the Fundamental Lemma of Calculus of Variations should be used in order to derive the L-E equation @1:04:18.

[วิระพิทักษ์ถิร]

Thank you very much for your lecture that make me firstly understand what purpose of CV. Your lecture is very excellent.

[tomaszsidorczuk]

time at 59:19; procedure of integration by parts - righthand side of the equation /// you applied the limits of integration x1 and x2 to the antiderivative n(x) in the FIRST term but you did not apply the limits of integration x1 and x2 to the antiderivative n(x) in the SECOND TERM. Is this operation logically coherent, correct? Explain, please

[AmatulAzreen]

What happen if df/dy is not zero? What d/dx*df/dy’ will be?