According to Einstein's Machian convictions, since inertia is determined only by matter, there can be no inertial structure or field Kragh, Helge. 1996.
Quite the same Wikipedia. Kragh studied mathematics and physics at the University of Copenhagen before obtaining his PhD in 1981 at the University of Matter and Spirit in the Universe - scientific and religious preludes to modern cosmology. Buy Einstein's Universe on Amazon.com ✓ FREE SHIPPING on qualified orders.