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In polchinski's first course on string, with
how to deduce
This post imported from StackExchange Physics at 2014-03-11 07:56 (UCT), posted by SE-user Zhao. zhanliang
Related post physics.stackexchange.com/q/73393
This post imported from StackExchange Physics at 2014-03-11 07:56 (UCT), posted by SE-user user26143
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