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The Little Book of String Theory by Steven S. Gubser

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Chapter SIX

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STRING DUALITIES

A DUALITY IS A STATEMENT THAT TWO APPARENTLY DIFFERent things are equivalent. I already discussed one example in the introduction: a checkerboard. You can think of it as black squares on a red background, or as red squares on a black background. Those are “dual” descriptions of the same thing. Here’s another example: dancing the waltz. Probably you’ve seen this in old movies, or maybe you’ve even done it. The man and the woman face one another, close together. There’s a particular way you hold your arms, but never mind about that. What matters most is the footwork. When the man steps forward on his left foot, the woman ...

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