j_bertolotti on Nostr: Classical electrodynamics also has both advanced and retarded Green's functions. 🤔 ...Classical electrodynamics also has both advanced and retarded Green's functions. 🤔Stijn De Baerdemacker (npub1s4u…7vpz) John Carlos Baez (npub1nf4…nqe4) Greg Egan (npub12cu…d38p)