The next level of analysis starts with the four Maxwell equations.
In the method, matrix elements are obtained by matching boundary conditions for solutions of Maxwell equations.
The formulation is based on integral form of Maxwell equations.
In terms of these forms, the Maxwell equations are:
Less severe assumptions result in the distributed element model, while still not requiring the direct application of the full Maxwell equations.
In 1900 Lorentz tried to explain gravity on the basis of the Maxwell equations.
Explanations referred to the Maxwell equations and electric charge motion.
Matrix elements are obtained by matching boundary conditions for solutions of Maxwell equations.
Since it is a solution of the Maxwell equations it should technically not be called a theory.
Often, they are also called the Maxwell equations.