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Enrique Loedel Palumbo (Montevideo Uruguay, June 29, 1901 – La Plata Argentina, July 31, 1962) was a Latin American physicist. Loedel Palumbo was born in Montevideo, Uruguay and studied at the University of La Plata in Argentina. He wrote his Ph.D. thesis on optical and electrical constants of sugar cane.〔"Optische und electrische Konstanten des Rohrzuckers", Annalen der Physik 384(6):533–49 (1926)〕 He then began his career as professor in La Plata. During Einstein's visit to Argentina in 1925〔Thomas F. Glick (1987) "Cultural issues in the reception of relativity", in Glick (ed.) ''The Comparative Reception of Relativity'', D. Reidel ISBN 90-277-2498-9 . "In his trips to Spain, Brazil, Argentina, and Uruguay, Einstein spoke mainly to engineers who comprised the rank-and-file of those with interest in his ideas."〕 they had a conversation about the differential equation of a point-source gravitational field, which resulted in a paper published by Loedel in Physikalische Zeitschrift. It is claimed that this is the first research paper on relativity ever published by a Latin American scientist.〔(Current Literature on Science of Science ), volume 20, 1991, pp. 167-169 (Review of Lewis Pyenson's book "Cultural Imperialism and Exact Sciences): p. 168: ''"Later, in 1925, Einstein visited Argentina, and was met by Enrique Loedel Palumbo, a young Uruguayan physicist then finishing a doctorate at La Plata. Palumbo asked Einstein about a system of differential equations for a point-source gravitational field. Einstein did not know the solution, but was interested in it. Palumbo published on the subject shortly thereafter and was hailed as Argentina's first world-class theoretician."''〕 Loedel Palumbo then spent some time in Germany working with Erwin Schroedinger and Max Planck. He returned to Argentina in 1930 and from there on concentrated on teaching. He published several scientific papers during his career in international journals and wrote several books (in Spanish). ==Loedel diagram== Max Born (1920) and systematically Paul Gruner (1921) introduced symmetric Minkowski diagrams in German and French papers, where the ct'-axis is perpendicular to the x-axis, as well as the ct-axis perpendicular to the x'-axis (for sources and historical details, see Minkowski diagram#Loedel diagram). In 1948 and in subsequent papers, Loedel independently rediscovered such diagrams.〔''Fisica relativista'', Kapelusz Editorial, Buenos Aires, Argentina (1955).〕 They were again rediscovered in 1955 by Henri Amar, who subsequently wrote in 1957 in American Journal of Physics: "I regret my unfamiliarity with South American literature and wish to acknowledge the priority of Professor Loedel's work", along with a note by Loedel Palumbo citing his publications on the geometrical representation of Lorentz transformations. Those diagrams are therefore called "Loedel diagrams", and have been cited by some textbook authors on the subject.〔E. Beneditto, M. Capriolo, A. Feoli, D. Tucci (2013) (Some remarks about underused Loedel diagrams ) European Journal of Physics 34(1)〕 Suppose there are two collinear velocities ''v'' and ''w''. How does one find the frame of reference in which the velocities become equal speeds in opposite directions? One solution uses modern algebra to find it: Suppose and , so that ''a'' and ''b'' are rapidities corresponding to velocities ''v'' and ''w''. Let ''m'' = (''a'' + ''b'')/2, the midpoint rapidity. The transformation : of the split-complex number plane represents the required transformation since and As the exponents are additive inverses of each other, the images represent equal speeds in opposite directions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Enrique Loedel Palumbo」の詳細全文を読む スポンサード リンク
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