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In 2007, and in a series of later papers, Joy Christian claimed to refuteBell's theorem, presenting an alleged local realistic model of the singletcorrelations using techniques from Geometric Algebra (GA). Several authorspublished papers refuting his claims, and Christian's ideas did not gainacceptance. However, he recently succeeded in publishing yet more ambitious andcomplex versions of his theory in fairly mainstream journals. How could thisbe? The mathematics and logic of Bell's theorem is simple and transparent andhas been intensely studied and debated for over 50 years. Christian claims tohave a mathematical counterexample to a purely mathematical theorem. Each newversion of Christian's model used new devices to circumvent Bell's theorem ordepended on a new way to misunderstand Bell's work. These devices andmisinterpretations are in common use by other Bell critics, so it useful toidentify and name them. I hope that this paper can serve as a useful resourceto those who need to evaluate new "disproofs of Bell's theorem". Christian'sfundamental idea is simple and quite original: he gives a probabilisticinterpretation of the fundamental GA equation a.b = (ab + ba)/2. After that,ambiguous notation and technical complexity allow sign errors to be hidden fromsight, and new mathematical errors can be introduced.

Does Geometric Algebra provide a loophole to Bell's Theorem? (with corrections)