New posts in Lagrangian Formalism

How is the kinetic matrix of a Lagrangian defined?

Varying the action with respect to the metric in one dimension

How to calculate functional derivative correctly?

Can Lagrangian have a potential term proportional to the quadratic or higher of velocity?

Does a non-lagrangian field theory have a stress-energy tensor?

Canonical isomorphisms vs Legendre transform

What is the energy integration constant from time symmetry in general relativity?

Quantum String action

Confusion about Lagrangian formulation of electromagnetics

Lagrangian of a free particle in Special Relativity and equivalence between mass and energy