A very interesting version of quantum mechanics.  See http://www.npl.washington.edu/npl/int_rep/tiqm/TI_toc.html (and ignore the silly WhyClublet discussion on this - theologians make notoriously wishful physicists).

See also http://www.npl.washington.edu/npl/int_rep/tiqm/TI_toc.html which is a letter writen by Professor Cramer discussing objections to his ideas.

A quick search reveals a link to CliffordAlgebra.
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CategoryPhysics