summary of Hamilton-Jacobi mechanics

[vanesch]

Some while ago I wrote this short summary, inspired by Goldstein, about Lagrangian and Hamiltonian's formulations of classical mechanics, in a rather informal style. Maybe it can be useful to some people.

[quetzalcoatl9]

this is good, maybe a derivation of the euler-lagrange equations right from the start (via least action) would be something to add to it