# Pre-Quantum Electrodynamics
Author: Jean-Sébastien Caux

##### Boundary Conditions
emsm.esm.D.bc

From \ref{Gr(4.23)}: \[ D^{\perp}_{above} - D^{\perp}_{below} = \sigma_f \label{Gr(4.26)} \] Then, \ref{Gr(4.25)} give

\[ {\bf D}^{\parallel}_{above} - {\bf D}^{\parallel}_{below} = {\bf P}^{\parallel}_{above} - {\bf P}^{\parallel}_{below}. \label{Gr(4.27)} \]

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Author: Jean-Sébastien Caux

Created: 2022-02-09 Wed 22:40