New posts in Variational Principle

In a Lagrangian, why can't we replace kinetic energy by total energy minus potential energy?

Normalization of the action in Special Relativity

How do physicists know when it is appropriate to use $\mathrm dx$ as if it is a number?

Principle of stationary action vs Euler-Lagrange Equation

History of Principle of Least Action

Why relativistic Lagrangian doesn't simply equal kinetic minus potential energy $L=T-V$?

What is the physical content of the principle of least action?

Does Newtonian $F=ma$ imply the least action principle in mechanics?

Action principle, Lagrangian mechanics, Hamiltonian mechanics, and conservation laws when assuming Aristotelian mechanics $F=mv$

Is the Lagrangian approach essentially a 'theory of everything'?