No physical concept is sufficiently defined without the knowledge of its domain of validity. - Léon Rosenfeld

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No physical concept is sufficiently defined without the knowledge of its domain of validity.

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About Léon Rosenfeld

Léon Rosenfeld (14 August 1904 – 23 March 1974) was a Belgian physicist and close collaborator of Niels Bohr.

Also Known As

Alternative Names: Leon Rosenfeld L.J.H.C. Rosenfeld Léon Jacques Henri Constant Rosenfeld
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Additional quotes by Léon Rosenfeld

Wesentliche Fortschritte in der Formulierung der allgemeinen Quantengesetze der elektromagnetischen und materiellen Wellenfelder haben neuerdings Heisenberg und Pauli… erzielt, indem sie die von Dirac erfundene <sub>"</sub>Methode der nochmaligen Quanteln" systematisch entwickelten. Neben gewissen sachlichen Schwierigkeiten, die viel tiefer liegen, trat dabei eine eigentumliche Schwierigkeit formaler Natur auf: der zum skalaren Potential kanonisch konjugierte Impuls verschwindet identisch, so daß die Aufstellung der Hamiltonischen Funktion und der Vertauschungsrelationen nicht ohne weiteres gelingt. Zur Beseitigung dieser Schwierigkeit sind bisher drei Methoden vorgeschlagen worden, die zwar ihren Zweck erfullen, aber doch schwerlich als befriedigend betrachtet werden können.
(Heisenberg and Paull have recently made significant progress in the formulation of the general quantum laws of electromagnetic and material wave fields by systematically developing the "method of repeated quantization" invented by Dirac. In addition to certain factual difficulties which lie much deeper, a peculiar difficulty of a formal nature arose: the momentum which is canonically conjugated to the scalar potential vanishes identically, so that the establishment of the Hamiltonian function and the commutation relations is not easy. To overcome this difficulty, three methods have been proposed which, although they fulfil their purpose, can hardly be regarded as satisfactory.)

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