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Re:Not Everyone Agreed with Einstein–Including Children, Sch... by aleph_minus_one on Saturday November 18, 2023 @10:58PM (#38328729)
For special relativity, see https://en.wikipedia.org/wiki/History_of_special_relativity

The necessary transformations for special relativity (Lorentz transformations) were already developed by Hendrik Lorentz and Henri Poincaré. Einstein's central contribution for special relativity was to reinterpret these equations in a novel way.

Re:Not Everyone Agreed with Einstein–Including Children, Sch... by mjklin on Sunday November 19, 2023 @12:33PM (#38335100)
Exactly. The innovation was in belief that the theoretical could also be real, that the equations could be trusted. Just as with Maxwell predicting the speed of light or Darwin studying birds—these scientists had the courage to firmly state the conclusion implied by their work.