Marni also envisioned motivic amplitudes becoming important, all the way back to her thesis.

Historically, after Witten’s twistor string paper appeared, Marni was quick to apply categorical methods to the scattering amplitudes. I learned of associahedra from her, and they are a way of tiling the moduli space of Riemann surfaces with punctures. Essentially, the goal is to re-write all super Yang-Mills theories categorically and have scattering amplitudes reduced to mere combinatorics. This will allow one to attack all related supergravity theories as well, via the SYM^2=SUGRA relation.

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