Deriving Feynman rules from Renormalized Lagrangian
48756
Why are derivatives in interaction terms treated differently from derivatives in the kinetic term?
41407
How to derive or justify the expressions of momentum operator and energy operator?
105572
Independent Variables of a Lagrangian
153727
Constant term in Lagrangian
41648
The Intuition behind l'Hopitals Rule
120474
Does the lagrangian contain all the information about the representations of the fields in QFT?
142892
Lagrangian Mechanics - Commutativity Rule $\frac{d}{dt}\delta q=\delta \frac{dq}{dt} $
77338
Lagrangian interpolation: degree of the interpolation polynomial
410
QM and Renormalization (layman)
101727
Dirac's remark that inspired Feynman when formulating path integral
51122
Lagrangian of Schrodinger field
71599
How to prove useful property of logarithm of generating functional in QFT?
67235
Free Particle Path Integral Matsubara Frequency
131780
How to directly evaluate path integral for harmonic oscillator by brute force method?
89004
Where does the partial derivative come from in Sakurai's derivation of the momentum operator?
14203
Finding the creation/annihilation operators
154772
The Momentum Operator in QM