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e = \frac{Z_1}{Z_2 \sqrt{Z_3}} e_r
</math>
:<math> \mathcal L = -\frac{1}{4} Z_3 F_{\mu \nu} F^{\mu \nu} + Z_2 \bar{\psi}(i \partial - m_r )\psi + \bar{\psi}\delta m \psi + Z_1 e \bar{\psi} \gamma^\mu \psi A_{\mu} </math>
== Fermion propagator in the interacting theory ==
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