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Einstein sensed a conflict between Newtonian mechanics and the constant speed of light determined by Maxwell's equations. [6]: 114–115 Regardless of the historical and scientific issues described above, Einstein's early thought experiment was part of the repertoire of test cases that he used to check on the viability of physical theories.
The Meaning of Relativity: Four Lectures Delivered at Princeton University, May 1921 is a book published by Princeton University Press in 1922 that compiled the 1921 Stafford Little Lectures at Princeton University, given by Albert Einstein.
Einstein, Albert (1956) [1922]. The Meaning of Relativity (5 ed.). Princeton University Press. The Meaning of Relativity Albert Einstein: Four lectures delivered at Princeton University, May 1921; How I created the theory of relativity Albert Einstein, 14 December 1922; Physics Today August 1982; Relativity Sidney Perkowitz Encyclopædia Britannica
Albert Einstein (/ ˈ aɪ n s t aɪ n /, EYEN-styne; [4] German: [ˈalbɛʁt ˈʔaɪnʃtaɪn] ⓘ; 14 March 1879 – 18 April 1955) was a German-born theoretical physicist who is best known for developing the theory of relativity. Einstein also made important contributions to quantum mechanics.
Albert Einstein. Relativity: the Special and the General Theory, 10th edition (there are a total of 17 editions). ISBN 0-517-029618 at Project Gutenberg; Relativity: The Special and General Theory public domain audiobook at LibriVox; Albert Einstein, Relativity: The Special and General Theory (1920/2000) ISBN 1-58734-092-5 at Bartleby.com
In Einstein's theory, it turns out to be impossible to find a general definition for a seemingly simple property such as a system's total mass (or energy). The main reason is that the gravitational field—like any physical field—must be ascribed a certain energy, but that it proves to be fundamentally impossible to localize that energy.
Einstein believed the problem of God was the "most difficult in the world"—a question that could not be answered "simply with yes or no". He conceded that "the problem involved is too vast for our limited minds". [11] Einstein explained his view on the relationship between science, philosophy and religion in his lectures of 1939 and 1941:
These questions depend on the definition of relativity, and Stachel argued that kinematics and the new view of space and time is the core of special relativity, and dynamical theories must be formulated in accordance with this scheme. Based on this definition, Einstein is the main originator of the modern understanding of special relativity.