M. Fabbrichesi , SISSA

In this lesson the professor introduce the **Hamilton's principle** and derive the **Lagrange equations**, he define the **Cyclic coordinates** and then he obtain the energy and momentum conservation laws (**Noether's theorem**). In this lesson a problem is added to the homework number 1(Homework.1.2) probmen 2.18 of the Chapter 2 of third edition of the text book.