Lagrange and Hamiltonian formulations

[amjad-sh]

Hello.
Do I need to grasp well the Lagrangian and Hamiltonian formulations in classical mechanics to go through quantum mechanics without struggles?

 

[Einj]

Yes, you definitely do. Quantum Mechanics relies heavily on the Hamiltonian formalism. Without it there is no hope to understand it. Moreover, if you want to include special relativity into Quantum Mechanics, you do that in a Lagrangian formalism. So I would say yes, absolutely.