Tree-level open bosonic string amplitudes satisfy a complete system of linear difference equations in kinematic variables whose number matches the independent parameters, recovering algebraic QFT structure as alpha approaches zero.
Two and Three Loop Amplitudes in the Bosonic String Theory
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Towards Equations for String Amplitudes
Tree-level open bosonic string amplitudes satisfy a complete system of linear difference equations in kinematic variables whose number matches the independent parameters, recovering algebraic QFT structure as alpha approaches zero.