I posted this elsewhere in the thread. To be convinced, read this frightening paper: http://cs.unc.edu/~fabian/course_papers/PtacekNewsham98.pdf http://cs.unc.e

I posted this elsewhere in the thread. To be convinced, read this frightening paper: http://cs.unc.edu/~fabian/course_papers/PtacekNewsham98.pdf http://cs.unc.edu/~fabian/course_papers/PtacekNewsham98.pdf