Four Hamiltonian Systems

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50, Eq. (38)]. Bohr did not respond to the detailed contents of Heisenberg's letter until early in 1931 when the situation had changed drastically, as Leon Rosenfeld recalled nearly two decades later: When I arrived at the (Copenhagen) Institute on the last day of February 1931, for my annual stay, the first person I saw was Gamow. As I asked him about the news, he replied in his own picturesque way by showing me a neat pen drawing he had just made. " Peierls had left the day before, "in a state of complete exhaustion," Gamow said.

634)] into his lectures at Chicago [Heisenberg, 1930a, p. 50, Eq. (38)]. Bohr did not respond to the detailed contents of Heisenberg's letter until early in 1931 when the situation had changed drastically, as Leon Rosenfeld recalled nearly two decades later: When I arrived at the (Copenhagen) Institute on the last day of February 1931, for my annual stay, the first person I saw was Gamow. As I asked him about the news, he replied in his own picturesque way by showing me a neat pen drawing he had just made.

Worked on this topic especially with the Austrian mathematician Walther Mayer, focusing on a five-dimensional theory of what they called 'semi-vectors' (Einstein and Mayer, 1931; I932a, 1932b). These efforts, had they succeeded, would have opened vistas bey~n~ the limita~ons of the existing quantum mechanics (removing also, in particular, the unwanted statistical foundation). l The Causality Debate 705 convenience of one or the other view in our thinking about nature. Henri Poincare has stated that we may be allowed to apply to real space the Euclidean as well as nonEuclidean geometry without fearing to be contradicted by facts.

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