## Evidence for Gravitational Theories, Volume 20 |

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### Contents

Gruppo fotogratico dei partecipanti al Coreo fuori testo | 1 |

R Brill Review of Jordans extended theory of gravitation | 51 |

A Sciiild Gravitational theories of the Whitehead type and the principle | 69 |

Copyright | |

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### Common terms and phrases

angular approximation assumed atom clock co-ordinate system color conservation laws consider cosmological covariant curvature curved defined density derivatives determined dimensionless discussed distance earth effect energy Eotvos experiment equations of motion equivalence principle expansion experimental field eqs field equations force frequency function galaxies geometry given gives gravitational acceleration gravitational constant gravitational field gravitational radiation gravitational red shift gravitational theory gravitational waves Hence integral interaction invariant isotropic Jordan line element linear Lorentz Mach's Principle mass distribution Maxwell's equations measured metric tensor momentum Newtonian null geodesics observations obtained orbit parallel transport parameter particle perihelion rotation Phys physical principle of equivalence problem R. H. Dicke radiation relativistic result Riemannian satisfied solution space space-time spatial special relativity spherically symmetric stars static stress-energy tensor surface tensor density tetrad transformation universe variational principle varying vector velocity wavelength Whitehead's theory world line zero