The Official String Theory Web Site:--> Theatre :--> String Colloquium 9
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String kinematics

. The motion of a string sweeps out a two-dimensional surface in spacetime called the world sheet.
. Feynman diagrams in string theory are two-dimensional surfaces, like the pants diagram below, which shows two strings joining into one:

A string Feynman diagram

The Second Superstring Revolution // String Theory: a multihistory

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