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What is a picture-changing operator in string theory? How do they work?

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The Stack Exchange engine does not deal well with "discussions" per se, it works on the basis of questions and answers. If you have a question about picture changing operators ask it. If you have many questions start by asking one (just one per "question", please) of the ones around the boundaries of your working knowledge, and you may be pleasantly surprised by the responses you get. Alternately you could try the chat, but it is not usually very active. –  dmckee Jul 22 '11 at 3:11
    
Related: mathoverflow.net/q/152295/13917 –  Qmechanic Jan 19 at 18:30
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