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Reference:
Bruus, H., and K. Flensberg (electronic version), Page 64, second paragraph:
What is the meaning of "phenomena with broken symmetry "?. Why would he use this concept to explain a special kind of crystal structure? those with translational invariance symmetry.
-- TEST COMMENT --
@Soroush
This comment is appropriate for the mean-field node.
One can insert LaTeX markup also; e.g., $ x^2 \log(x) $, or
$$ y = x^2 + z $$.