A single crossing-symmetric scattering amplitude has equivalent pole expansions in different exchange channels. Its scattering-amplitude factorization reproduces the string spectrum and couplings in each channel without adding the channel expansions again.

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  1. Closed-string scattering amplitude
  2. Polyakov path integral
  3. Polyakov action
  4. Bosonic string theory
  5. String theory
  6. Branch of physics
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