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pro vyhledávání: '"Lemma 12 in Newton's Principia"'
Autor:
Alessandra Fiocca, Andrea Del Centina
Publikováno v:
Archive for History of Exact Sciences. 74:255-279
To solve the direct problem of central forces when the trajectory is an ellipse and the force is directed to its centre, Newton made use of the famous Lemma 12 (Principia, I, sect. II) that was later recognized equivalent to proposition 31 of book VI