Sign of Feynman diagram with single-propagator closed loop
134718
Why is there extra minus sign in Feynman's rules for every closed fermionic loop?
148463
How do I get the negative sign in the expression for Gravitational Potential Energy?
154841
Computing symmetry/combinatorial factor for a diagram in $\phi^4$ theory
158118
Circle with a cross inside feynmp
113610
Spinor field normalisation from poles in the propagator
41028
Is there a combinatorial way to see the link between the beta and gamma functions?
94896
Deriving a QM expectation value for a square of momentum $\langle p^2 \rangle$
128875
Expectation values of the position operator is equal to zero in case of even potentials?
17394
Sign of determinant when using $det A^\top A$
12422
Derivation of $E=pc$ for a massless particle?
69481
Classical limit of the path integral formulation of quantum mechanics
29952
Time-ordering vs normal-ordering and the two-point function/propagator
146842
What is the Mediator in this Feynman Diagram $q\bar{q} \rightarrow gg$?
2786
The staircase paradox, or why $\pi\ne4$
112398
Proof that the effective/proper action is the generating functional of one-particle-irreducible (1PI) correlation functions
63118
Finding the closed form of the determinant of the Hilbert matrix
22842
The Interpretation of $|\psi|^2$ and the No-Clone Theorem