Talk:Enrique Loedel Palumbo

Diagram
The Loedel frame developed in this article would be clearer with a diagram. The two given velocities v and w correspond to rapidities a and b. The algebraic solution given to the query Loedel made to Einstein guides diagramation. Two images, before and after the sought Lorentz transformation, can exhibit the premise and solution.Rgdboer (talk) 01:27, 7 December 2012 (UTC)
 * A diagram was found to illustrate the resulting Loedel frame.Rgdboer (talk) 21:14, 25 April 2013 (UTC)

Source
The article says: "When Albert Einstein was in La Plata, Loedel Palumbo asked him about the existence of a particular type of frame of reference. Loedel Palumbo hypothesized two collinear velocities v and w. Does there exist a frame of reference in which the velocities transform to equal speeds in opposite directions? The affirmative answer was communicated by Loedel Palumbo in Physikalische Zeitschrift."

I think this statement confuses two different subjects:

a) Loedel's paper in "Physikalische Zeitschrift" (1926) and his discusion with Einstein was about a point-source gravitational field. In a review (Current Literature on Science of Science) of Pyenson's book "Cultural Imperialism and Exact Sciences", it is stated:
 * 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.

b) Regarding the new diagram, Loedel himself (1957) referred to his 1948 paper "Aberracion y relatividat" in which the new type of diagram was introduced. He wrote in 1957:


 * The geometric representation introduced by Professor Henri Amar in his paper "New geometric representation of the Lorentz transformation" [Am. J. Phys. 23, 487, 1955] is identical with the representation found by me and published more than eight years ago in Anales de la Sociedad Cientifica Argentina. It can be found in the following papers and books:
 * (1) "Aberracion y Relatividat". Anales soc. cient. argentina 145, 3–13 (1948), p. 6, Fig. 2 and Fig. 6, p.13. ....(+more papers in Spanish).

I have no access to the German 1926 paper, so I cannot tell whether Loedel diagrams were used in this paper. But it seems improbable, because Loedel himself referred to his 1948 paper in which the new diagram was published first. So the information in the article should be corrected in accordance with Loedel's own statement. --D.H (talk) 21:38, 25 November 2013 (UTC)

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 * Enrique Loedel Palumbo c1925.png