1. D.M. Greenberger, M.A. Home and A. Zeilinger, “Going beyond Bell’s Theorem”, in Bell’s Theorem, Quantum Theory and Conceptions of the Universe, M. Kafatos, ed., Kluwer Academic Publishers, Dordrecht, The Netherlands, 1989, p. 73; D.M. Greenberger, M.A. Home, A. Shimony and A. Zeilinger, `Bell’s Theorem without Inequalities“, Am. J. Phys. 58, 1131 (1990); N.D. Mermin, ”Quantum Mysteries Revisited“, Am. J. Phys. 58, 731 (1990).
2. The z-direction need not be the same for all the particles, but we assume for simplicity that it is.
3. The history of the Borromean rings recounted here has been taken from Supplement to Not Knot by D. Epstein and C.Gunn (Jones and Bartlett Publishers, Boston, MA, 1991), p. 7.
4. J.S. Bell, Physics (Long Island City, N.Y.) 1, 195 (1964); J.F. Clauser, M.A. Home, A.Shimony and R.Holt, Phys. Rev. Lett. 23, 880 (1969).
5. A. Zeilinger, M.A. Home and D.M. Greenberger, “Higher-order Quantum Entanglement”, in Workshop on Squeezed States and Uncertainty Relations, D. Han, Y.S. Kim and W.W. Zachary, eds., NASA Conference Publication 3135, 1992.