Space-time discretization of Maxwell's equations in the setting of Geometric Algebra

The Geometric Algebra (GA) for Minkowski space-time and Maxwell's equations in the setting of GA are briefly outlined. The constitutive equations are discussed in more detail. A discrete version of GA for a Cartesian grid is investigated and is shown to be equivalent to Tonti's approach. Furthermore, under quite natural assumptions both schemes coincide with the Finite Integration Technique (in 3D space) and Leap-Frog time integration.