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Aug 18 at 23:31 comment added Gabriel Ybarra Marcaida Which edition of P&S are you consulting? I don't see the $\delta_2 \delta_m$ term in mine (1e).
Oct 20, 2021 at 12:43 vote accept Gold
Oct 20, 2021 at 12:12 history answered Qmechanic CC BY-SA 4.0