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when toggle format what by license comment
Mar 20, 2021 at 14:43 comment added LieAlgebraGuy1999 Sorry for the late response, but there was no quantum mechanics involved in this section in the Gerry and Knight textbook. Also there should be a plus sign between the squares of your result as there is in Quantum Theory of Light by Loudon
Mar 14, 2021 at 0:51 history answered ziv CC BY-SA 4.0