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