In fact, when starting from the complete theory, Einstein's equation can be used to derive these more complicated laws of motion for matter as a consequence of geometry, but deriving from this the motion of idealized test particles is a highly non-trivial task, cf. Poisson 2004.
Στην πραγματικότητα, ξεκινώντας από την πλήρη θεωρία, η εξίσωση του Einstein μπορεί να χρησιμοποιηθεί για to derive these more complicated laws of motion for matter as a consequence of geometry, but deriving from this the motion of idealized test particles is a highly non-trivial task βλ. Poisson 2004.