- #1

KurtLudwig

Gold Member

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## Summary:

- I have read the paper arXiv:0901.4005v2 by A. Deur (and do not follow most of the mathematics). From my mathematical background, I do know that non-commutative means a x b is not equal to b x a. From Wikipedia, rotating something 90 degrees along one axis and then 90 degrees along a different axis is not the same as doing them the other way round. At a physics undergraduate level, what is the meaning of non-Abelian in the context of this paper?

I have read the paper arXiv:0901.4005v2 by A. Deur (and do not follow most of the mathematics). From my mathematical background, I do know that non-commutative means a x b is not equal to b x a. From Wikipedia, rotating something 90 degrees along one axis and then 90 degrees along a different axis is not the same as doing them the other way round. At a physics undergraduate level, what is the meaning of non-Abelian in the context of this paper?