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  2. Theory of relativity - Wikipedia

    en.wikipedia.org/wiki/Theory_of_relativity

    The term "theory of relativity" was based on the expression "relative theory" (German: Relativtheorie) used in 1906 by Planck, who emphasized how the theory uses the principle of relativity. In the discussion section of the same paper, Alfred Bucherer used for the first time the expression "theory of relativity" (German: Relativitätstheorie ...

  3. Elwin Bruno Christoffel - Wikipedia

    en.wikipedia.org/wiki/Elwin_Bruno_Christoffel

    Elwin Bruno Christoffel (German: [kʁɪˈstɔfl̩]; 10 November 1829 – 15 March 1900) was a German mathematician and physicist.He introduced fundamental concepts of differential geometry, opening the way for the development of tensor calculus, which would later provide the mathematical basis for general relativity.

  4. Introduction to the mathematics of general relativity - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_the...

    The Christoffel symbols find frequent use in Einstein's theory of general relativity, where spacetime is represented by a curved 4-dimensional Lorentz manifold with a Levi-Civita connection. The Einstein field equations – which determine the geometry of spacetime in the presence of matter – contain the Ricci tensor .

  5. Spacetime - Wikipedia

    en.wikipedia.org/wiki/Spacetime

    y ' must equal y and z ′ must equal z, otherwise whether a fast moving 1 m ball could fit through a 1 m circular hole would depend on the observer. The first postulate of relativity states that all inertial frames are equivalent, and transverse expansion/contraction would violate this law. [43]: 27–28 From the drawing, w = a + b and x = r + s

  6. Scientists Explain What It Means If We’ve Reached ... - AOL

    www.aol.com/lifestyle/scientists-explain-means...

    New research suggests that we may have reached peak human life span. Experts explain the findings and how to boost longevity. Scientists Explain What It Means If We’ve Reached Peak Human Life Span

  7. Postulates of special relativity - Wikipedia

    en.wikipedia.org/wiki/Postulates_of_special...

    1. First postulate (principle of relativity) The laws of physics take the same form in all inertial frames of reference.. 2. Second postulate (invariance of c) . As measured in any inertial frame of reference, light is always propagated in empty space with a definite velocity c that is independent of the state of motion of the emitting body.

  8. Christoffel symbols - Wikipedia

    en.wikipedia.org/wiki/Christoffel_symbols

    The Christoffel symbols find frequent use in Einstein's theory of general relativity, where spacetime is represented by a curved 4-dimensional Lorentz manifold with a Levi-Civita connection. The Einstein field equations —which determine the geometry of spacetime in the presence of matter—contain the Ricci tensor , and so calculating the ...

  9. General relativity - Wikipedia

    en.wikipedia.org/wiki/General_relativity

    In the preface to Relativity: The Special and the General Theory, Einstein said "The present book is intended, as far as possible, to give an exact insight into the theory of Relativity to those readers who, from a general scientific and philosophical point of view, are interested in the theory, but who are not conversant with the mathematical ...