%maxwell.tex: 
 
%begin macros
\def\g{\bigtriangledown}
\baselineskip=14pt
\parskip=10pt
\magnification=\magstephalf
\parindent=0pt
\overfullrule=0in
\def\frac#1#2{{#1 \over #2}}
\nopagenumbers
%end macros
 

\centerline
{
\bf  The meaning of LIGHT (and E\&M!): MAXWELL'S EQUATION
}
$$
\g \cdot {\bf D} = \rho \quad, \quad
\g \cdot {\bf B} = 0 \quad, \quad
\g \times {\bf E} \, = \, -\frac{ \partial {\bf B}}{\partial t} \quad, \quad
\g \times {\bf H} \, = \, {\bf J} \, + \, \frac{ \partial {\bf D}}{\partial t} \quad .
$$

$\bf{E}$: electric field; $\bf{H}$: magnetic field ;
$\bf{D}$: electric displacement field ; $\bf{B}$:  magnetic flux density ; $\rho$: electric charge density;
{\bf J}: free current density.

\end