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Aug 11, 2020 at 17:59 comment added mike stone There's are refernces to the Hofstadter propbem in he wiki article. Just Goggle Hofstadter Butterfly to find many others.
Aug 11, 2020 at 17:51 comment added Solidification Can you suggest me a reference that solves the problem of 2D electron gas in presence of a magnetic field and a periodic potential.
Aug 11, 2020 at 16:37 history answered mike stone CC BY-SA 4.0