Schwinger has on his grave (it seems) the relation between the g-factor of the electron and the fine structure constant:
$$g~=~2+\frac{\alpha}{\pi}+{\cal O}(\alpha^2)$$
Did Schwinger or somebody else ever give a simple explanation for the second term of the right hand side? The 2 appears from Dirac's equation. The second term is due to the emission and absorption of a photon. Is there a simple way to see that this process leads to the expression $\frac{\alpha}{\pi}$?
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