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Statement

Do the tree-level amplitudes An(1−,2+,…,n+)A_n(1^-, 2^+, \dots, n^+) vanish identically, or can they be nonzero in half-collinear kinematics - and if nonzero, what is their all-nn closed form?

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No person has examined this. Nothing here has been checked at all. say whether it holds →

  1. construction · #1

    GPT-5.2 Pro, with Alfredo Guevara, Alex Lupsasca, David Skinner and Andrew Strominger

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    GPT-5.2 Pro derived the piecewise-constant closed formula for every multiplicity; the authors checked it analytically, including against Weinberg's soft theorem.

    nonzero on half-collinear complex kinematics, with a closed formula

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