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Jan 23, 2017 at 21:28 history edited Qmechanic CC BY-SA 3.0
Added explanation
Jan 23, 2017 at 16:17 comment added udrv @QMechanic Yeah, I know, I forgot to mention accidental degeneracy.
Jan 23, 2017 at 13:10 vote accept cx1114
Jan 23, 2017 at 13:10
Jan 23, 2017 at 12:49 comment added cx1114 to be frank, i have been struggling with this point for quite some time, and in fact many books on group theory for and by physicists do state this, and sort of 'prove' it by excluding accidental degeneracy. but i never understood their arguments. but the other answer seems to provide a much rigorous argument.
Jan 23, 2017 at 11:33 history answered Qmechanic CC BY-SA 3.0