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im planing on selling my 1984 Cadillac Seville so i can get a new car. i dont know much about cars so if anyone theres anyone here that can help that would be appreciated. problems: i need to replace the fuel injector, 2 doors wont open from the inside everything else is fine. the interior is...

I've been studying Dirac operators for the last few months as part of my work on the Atiyah-Singer Index theorem. Apparently these gadgets and the spinor bundles on which they act were invented by Dirac to solve some sort of problem in quantum mechanics. Does anybody know about Dirac's...

Sometimes physicists and even chemists working on problems in quantum mechanics will say that they are using "group theory" to do a calculation. Upon probing more deeply, I have come to realize that they are really doing representation theory, often of SU(n), rather than anything a...