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when toggle format what by license comment
Mar 21, 2019 at 21:45 vote accept C-Roux
Mar 21, 2019 at 21:05 comment added C-Roux Oh, now I see where was the problem, I permuted operators $b_{k}b_{k'}$ without changing sign due to anti-commutation relation. Thank you for your answer.
Mar 21, 2019 at 20:46 history answered MadMax CC BY-SA 4.0