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my intention is mainly to state that gravity is caused by invariant elementary gravitational charges, similar to the cause of electromagnetism by invariant elementary gravitational charges. Both interaction fields propagate with c. The equations of motions of the fields and of the particles/bodies are to be derived with the use of invariants from a Lorentz-invariant action integral, integrated about a finite space-time domain. However, appropriate subsidiary conditions for the fields and for the particles must be considered. For the particles the subsidiary conditions are in accordance with particle number conservations.