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(b_{r}, b_{s}^{⋆}) \equiv b_{r} b_{s}^{⋆} - b_{s}^{⋆} b_{r} = δ_{r s}

${{(b_r,b_s^{\star})} \equiv {b_r b_s^{\star} – b_s^{\star} b_r = \delta_{rs}} }$

Error