Euler-Lagrange eqs. use in QFT
67641
Why should field operators satisfy the classical equations of motion?
17414
Lagrangian of an effective potential
106120
Mathematica Improved Euler's Method
28946
Derivation of Spin Lagrangian
4989
Why are there only derivatives to the first order in the Lagrangian?
155492
Exercise on local and global symmetry for a given Lagrangian density
10785
Form of the Classical EM Lagrangian
100985
Effect of linear terms on a QFT
51122
Lagrangian of Schrodinger field
109187
The differences between Lagrange and Leibniz's derivative notations
94896
Deriving a QM expectation value for a square of momentum $\langle p^2 \rangle$
118232
Is it possible for the Lagrange multiplier to be equal to zero?
77338
Lagrangian interpolation: degree of the interpolation polynomial
7447
Self Teaching QFT
51294
Derivation of Euler's equations for rigid body rotation
126390
Covariance of Euler-Lagrange equations under change of generalized coordinates
100004
Differentiating $e^x$ from first principles using limits.