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closed string Fourier modes

closed string phase space

closed string positors

closed string propagator=physical states

closed string states

closed string symmetries

closed string tree amplitude

closed string vertex operators

Minkowski vertex

harmonic oscillator

open string Fourier modes

open string loop amplitudes

open string phase space

open string positors

open string propagator/physical states

completing the square

open string states

classical string observables/Poisson bracket

open string symmetries

open string tree amplitude

open string vertex operator

flat sheet vector fields

string background fields/massless string states=10D background fields