Three-point functions: SFT, integrability, and perturbative calculations.

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I discuss several recent efforts
in relating string field theory calculations of BMN BMN BMN and BMN BMN BPS
correlation functions to direct perturbative calculations and
integrability-assisted methods. I review the next-to-leading order agreement
between strings and perturbation theory in the SO(6) sector, a conjectured
extension of the integrability techniques by Escobedo, Gromov, Sever, Vieira from
the SU(2) to the full SO(6) sector and agreement with SFT and PT in it at the
leading order; finally, I discuss the issue of equating exactly extremal and
non-extremal correlators at NLO in the integrability-assisted calculation.