Classical action as $S$-matrix generating functional at the tree-level
114901
In what sense is the proper/effective action $\Gamma[\phi_c]$ a quantum-corrected classical action $S[\phi]$?
61046
General construction of $W_n$-state
48930
Least-action classical electrodynamics without potentials
44747
Finding the effective Hamiltonian in a certain subspace
35801
Traceless matrices and commutators
134162
What is a basis for the space of $n\times n$ Hermitian matrices?
116718
Motivating the ansatz for the infinitesimal translation operator
34886
Transvection matrices generate $ \operatorname{SL}_n(\mathbb{R}) $
86875
Finding the null space of symmetric matrix generated by outer product
60005
Determining the Orbits/Orbit Space of $O(3)$ on Real 3 by 3 Traceless Symmetric Matrices
89004
Where does the partial derivative come from in Sakurai's derivation of the momentum operator?
13644
Is the change in the Lagrangian always a total derivative for symmetry transformations of the action?
75104
Existence of some type matrix
39334
Non-degenerate bilinear forms and invertible matrices
78298
On the nilpotence of the matrix $AB-BA$
101185
Jacobian Matrix in dynamical systems
141907
Haag's theorem and practical QFT computations