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Reference: Spacetime and Gravitation by W. Kopczynski and A. Trautmann Wiley © 1992
Page 50 The "paradox" of twins (the clock paradox) If one of two brothers is sent for a long journey into space, he will return to earth younger than his brother because he is subjected to acceleration.
Page 59 There are no bodies ideally rigid. We can only speak of rigid bodies when no forces act upon them.
Page 118 Relativistically, mass corresponds to energy, and the mass density to energy density, which, in turn, is proportional to T00 a component of the energy momentum tensor.
Page 129 In electrodynamics, the equations of motion (of charges) are independent of the (electromagnetic) field equations. In the general relativity theory the equations of motion result from the field equations.
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