11. His negative results were fundamentally reconciled only through Einstein's Special Relativity theory of 1905. 12. The Einstein field equations ( EFE ) are the core of general relativity theory . 13. Albert Einstein's discovery of the general relativity theory relied upon thought experiments and mathematics. 14. With the development of relativity theory in physics, this question became vastly more complicated. 15. The ARL had provided significant enhancements to general relativity theory . 16. His original relativity theory predicted that the universe would either collapse or expand forever. 17. In relativity theory , such ideas have been implemented in the form of Einstein Cartan theory. 18. Then in 1905 came relativity theory and an entirely new way to look at space. 19. Albert Einstein introduced the relativity theories for light and gravity in 1905 and 1915 respectively. 20. Reference frames play a crucial role in relativity theory .
