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Has anyone noticed that Feynman did for complex arithmetic what Hamilton did for quaternion arithmetic. Complex arithmetic is more difficult to make sense of because it makes no spatial sense. But both Feynman and Hamilton suffer from an overloading problem. If you use the quaternion division algebra then you are stuck with polar and axial conventions or rules, which should be made explicit by using complex quaternions. Complex arithmetic needs complex octonions to make explicit what is crammed into the imaginary unit, which can be expressed as
any permutation or association of o(a(bc)) . So in his "QED strange theory" he shows how to generalize the Principle of Least Time by analyzing a mirror by considering possible paths and doing complex arithmetic - now connected to the best tested theory in Physics. It should extend to complex octonions, which should have direct physical meaning.
Maybe physicists have been making Octonionic Sense all along without explicitly noticing it, and that octonions are so ordinary that we just take it for granted.