21. This is true in special relativity theory , even though individually photons have no rest mass. 22. Indeed, such a generalization is vital to relativity theory . 23. He also published a book on the elements of relativity theory and relativistic mechanics and electrodynamics. 24. The " rapidity " replaces the " velocity " in kinematics and dynamics of relativity theory . 25. He also studied differential geometry, and wrote a book of lectures on Einstein's general relativity theory . 26. According to relativity theory , that stirring action should send out a weak signal of gravity waves. 27. As per relativity theory , mass warps the space. 28. He was well known for his analysis of the foundations of relativity theory and quantum mechanics. 29. Low energy objects would be handled by quantum theory and high energy objects by relativity theory . 30. This theory also involves Einstein s Time Dilation by Relativity Theory , Applied Physics and Cosmic Activity.
