Talk:Enrique Loedel Palumbo

	Biography portal This article is within the scope of WikiProject Biography, a collaborative effort to create, develop and organize Wikipedia's articles about people. All interested editors are invited to join the project and contribute to the discussion. For instructions on how to use this banner, please refer to the documentation.BiographyWikipedia:WikiProject BiographyTemplate:WikiProject Biographybiography articles
	This article is supported by the science and academia work group (assessed as Low-importance).

‹See TfM›

Physics: Biographies Mid‑importance

	Physics portal This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics articles
Mid	This article has been rated as Mid-importance on the project's importance scale.
	This article is supported by Biographies Taskforce.

Uruguay Mid‑importance

	Uruguay portal This article is part of WikiProject Uruguay, an attempt to expand, improve and standardise the content and structure of articles related to Uruguayan people. If you would like to participate, you can edit this article, or visit the project page, where you can join the project and see a list of objectives.UruguayWikipedia:WikiProject UruguayTemplate:WikiProject UruguayUruguay articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

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)[reply]

A diagram was found to illustrate the resulting Loedel frame.Rgdboer (talk) 21:14, 25 April 2013 (UTC)[reply]

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)[reply]

A Commons file used on this page has been nominated for deletion

The following Wikimedia Commons file used on this page has been nominated for deletion:

Enrique Loedel Palumbo c1925.png

Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 18:28, 6 December 2018 (UTC)[reply]