Functional derivatives in Feynman Path Integral
86756
Can we teach Mathematica about functional differentiation?
109187
The differences between Lagrange and Leibniz's derivative notations
62387
What are independent parameters in Hellmann–Feynman theorem?
983
Use partial or covariant derivatives when deriving equations of a field theory?
87914
Contradictory result for scalar-field propagator from Feynman rules and LSZ formula
17414
Lagrangian of an effective potential
138424
Scalar field Derivative. Real vs Complex
15482
Paths integrals in the complex plane
17785
Variational Derivation of Schrodinger Equation
20373
How to arrive on the diffraction pattern for the double slit experiment using path integrals for the Gaussian slit case?
21917
Mathematical Prerequisites for QFT
97418
Fourier Transform of Derivative
121584
Rigor in quantum field theory
82135
Lagrangian to Hamiltonian in Quantum Field Theory
123519
Fréchet differentiability from Gâteaux differentiability
76845
Cauchy's Theorem on Path Integrals
145136
When can we interchange the derivative with an expectation?