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$\begingroup$ The second edition of Zagoskin's many-body book has an appendix discussing this derivation too, IIRC. $\endgroup$Tobias Fünke– Tobias Fünke2025-10-04 14:40:21 +00:00Commented Oct 4, 2025 at 14:40
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$\begingroup$ @TobiasFünke Yes, but it seems that there is no detailed derivations either. $\endgroup$Jason Chen– Jason Chen2025-10-05 00:35:02 +00:00Commented Oct 5, 2025 at 0:35
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$\begingroup$ It is better if you write an answer yourself than editing the question. A question should be a question, and an answer (attempt) should be written as an answer. This also makes the question more readable. $\endgroup$Tobias Fünke– Tobias Fünke2025-10-05 07:00:24 +00:00Commented Oct 5, 2025 at 7:00
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$\begingroup$ @TobiasFünke You are right, I've moved my attempt to an answer. $\endgroup$Jason Chen– Jason Chen2025-10-05 07:50:26 +00:00Commented Oct 5, 2025 at 7:50
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