Question about the trace in simplifying $e\!-\!e$ cross section
90636
Why does the trace show up in such expressions?
40837
Why $e^{i(π/3)} \ne -1$?
85311
Proving that $e^{\pi}-{\pi}^e\lt 1$ without using a calculator
154270
Why is $ \overline{e^z} = e^\overline{z} $?
124988
$E=kT$ or $\frac32kT$?
64432
Physical or geometric meaning of the trace of a matrix
87914
Contradictory result for scalar-field propagator from Feynman rules and LSZ formula
74065
Proof of de Broglie wavelength for electron
81375
Why does $V(I(S))=\overline{S}$?
94173
Deriving the Lagrangian for a free particle
116778
Calculation of an integral via residue.
61073
Why is electric flux defined as $\Phi = E \cdot S$?
3876
Did I derive a new form of the gamma function?
73230
Roots of the incomplete gamma function
25262
Why can we apply the $E=hf$ equation for electrons?
145157
Coordinate-Free Definition of Trace.
140459
Why is $\left(e^{2\pi i}\right)^i \neq e^{-2 \pi}$?