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Acknowledgements

Conversations and correspondence with many people have helped form my views on these issues. I cannot list them all, but I especially want to thank Abhay Ashtekar, John Barrett, Louis Crane, James Dolan, Louis Kauffman, Kirill Krasnov, Carlo Rovelli, and Lee Smolin.


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© 1999 John Baez
baez@math.removethis.ucr.andthis.edu

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