Quantum field theory and string theory

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richerrich
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What is the relationship between quantum field theory and string theory?
 
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quantum field theory is always a limit of string theory*. for example, you can deduce things like scattering amplitudes of gluons and gravitons from string theory.

*probably too strong of a statement, it might be possible for some qft's to not be generalizable to string theory (in a non trivial way at least)