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By Abhay Ashtekar

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25. 19. 26. J. Earman, “Sharpening the electromagnetic arrow of time,” preprint, 2007. 27. J. A. Wheeler to R. P. Feynman, 26 March 1942, Feynman Papers, Caltech. 28. R. P. 4, f. 32. 29. L. S. Schulman, J. Math. Phys. 36, 2546 (1995). 30. R. P. Feynman, Phys. Rev. 76, 769 (1949). 31. R. P. Feynman to J. A. 10; quoted in full in Ref. 10, p. 462. October 9, 2008 9:45 WSPC - Proceedings Trim Size: 9in x 6in pi07 14 QUO VADIS, PHYSICA? M. com The history of physics is short, compared with mathematics and astronomy, starting in about 1800.

21, 425 (1949). 16. K. Schwarzschild, Nachr. K¨ onigl. Ges. Wiss. -Phys. Kl. (1903) 126. 17. H. Tetrode, Zs. Phys. 10, 317 (1922). 18. A. D. Fokker, Zs. Phys. 58, 386 (1929). 19. J. A. Wheeler with K. Ford, Geons, Black Holes, and Quantum Foam (Norton, New York, 1998). 20. J. A. Wheeler to A. Einstein, 3 November 1943, Albert Einstein Archives, The Hebrew University of Jerusalem, call nr. 23-442. 21. J. Gleick, Genius. The Life and Science of Richard Feynman (Pantheon, New York, 1992). 22. A. Einstein, Phys.

Keywords: Semiclassical propagator; Quantum Hamilton-Jacobi. 1. ” Sometimes I wonder about a narrower question: the unreasonable effectiveness of classical mechanics for quantum mechanics, and occasionally, vice-versa. What I will tell you is how Roncadelli and I started from an old, and at the time unsuccessful, way to quantize, how we made this technique a bit more tractable, and how finally it forced us to consider that same “unreasonable effectiveness” to which I alluded. As you will see, our progress depended on recognizing the propagator when it appeared, and perhaps more important, exploiting our result brought us squarely into the world of path integrals, where the occasional solved propagator can lead to new results for this quantization scheme.

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