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  • $\begingroup$ Thanks for the pointer. I went to the library and checked out this book. The explanation you refer to doesn't jump out at me but I suspect it's there in a non-obvious way. $\endgroup$ Commented Nov 9, 2009 at 22:30
  • $\begingroup$ This book has only 8 chapters. $\endgroup$ Commented Dec 10, 2016 at 10:44