# Video Euler-Lagrange Equation

Level 3 requires the basics of vector calculus, differential and integral calculus. Suitable for undergraduates and high school students.

## Content of the video

- 00:00 Why all this?
- 00:52 Action Functional
- 01:53 Nature is extemal
- 02:44 Calculate the action
- 03:52 Structure of the Euler-Lagrange equation
- 05:20 Lagrange function
- 05:54 How to use Euler-Lagrange equation

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