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Is there any simple proof of the no-ghost theorem in string theory?

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It depends whether the demonstration of the equivalence with the light-cone gauge spectrum - which is manifestly ghost-free - is simple in your opinion. – LuboŇ° Motl May 19 '11 at 7:21
A couple of references: (1) P. Goddard and C. B. Thorn, Phys. Lett. B40 (1972) 235; (2) Green, Schwarz and Witten, "Superstring Theory, Vol 1"; (3) Wikipedia – Qmechanic May 19 '11 at 18:57

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