The matter-waves, well-known from numerous experiments, can be described as beat waves of two counter-moving waves. Thus mass is oscillating space-time, which results from the superposition of two counter-moving space-time waves. The duality of this counter-motion derives the duality of the electric force. And the inertia of the mass arises from the frequency. The electric force arises from a space- or energy- shift. Gravitation arises from the change of the energy-density of the electric field (by which the gravitational acceleration is independent of the mass) and yields the same results as GR. And the magnetic field appears to be an angle between the direction in which the electric field propagates and the direction in which it exerts its force.

gravitation, magnetism, electric fields, relativity, quantum mechanics