Why does it seem like there is always a Lagrangian?
40340
How general is the Lagrangian quantization approach to field theory?
61142
Is there any physics that cannot be expressed in terms of Lagrange equations?
152997
Is there a kind of Noether's theorem for the Hamiltonian formalism?
67641
Why should field operators satisfy the classical equations of motion?
155913
Lagrangian for free particle in special relativity
13110
Intuitively, why is a reversible process one in which the system is always at equilibrium?
11358
Eigenvalues of the Lagrangian?
17588
Can Lagrangian be thought of as a metric?
3603
Lagrangian and Hamiltonian EOM with dissipative force
138214
Why does a surface always exert force normal to it?
118232
Is it possible for the Lagrange multiplier to be equal to zero?
153727
Constant term in Lagrangian
155492
Exercise on local and global symmetry for a given Lagrangian density
22988
Are vacuum fluctuations really happening all the time?
51122
Lagrangian of Schrodinger field
44282
How do I show that there exists variational/action principle for a given classical system?
140184
Why all theories are Lorentz invariant?