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selfAdjoint
#2
Jun30-06, 03:46 PM
Emeritus
PF Gold
P: 8,147
I wou;d say it was when Fadeev and Popov quantized nonabelian gauge therory and found their ghosts (foreseen by Feynmann) as necessary to preserve unitarity within gauge freedom. Once physicsts had gulped and swallowed that, they would gulp and swallow anything.