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Those Wikipedia and Wikiversity pages (History of Lorentz transformations and History of Topics in Special Relativity) have lots of information on the mathematical history of the Lorentz transformations preserving: $$\pm\left[x_{0}^{2}-x_{1}^{2}-x_{2}^{2}-x_{3}^{2}\right]$$ Starting as early as 1800 by Gauss and many others, quadratic forms equivalent to ...


I found that a prediction of a solar eclipse was made Nicholas Culpeper for the April 8, 1652 eclipse in England. At first I was confused by the date, thinking the prediction was wrong, then realized it is the Julian Date which corresponds to the Georgian date in April. Black Monday: the Great Solar Eclipse of 1652


Best I could determine after a searching for a couple of hours, this function was first introduced in the following publication, a scan of which is made available by the Bibliothèque nationale de France: P. Langevin, "Magnétisme et théorie des électrons," Annales de chimie et de physique, 8:5 (1905), 70-127. On page 117 one finds: Le moment ...

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