The relativity of inertia and reality of nothing

We first see that the inertia of Newtonian mechanics is absolute and troublesome. General relativ-ity can be viewed as Einstein’s attempt to remedy, by making inertia relative, to matter—perhaps imperfectly though, as at least a couple of freedom degrees separate inertia from matter in his theory. We consider ways the relationist (for whom it is of course unwelcome) can try to over-come such undetermination, dismissing it as physically meaningless, especially by insisting on the right transformation properties