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Precise statement
Let $T_k$ be the least $t$ such that every equinumerous $t$-coloring of $[tn]$ contains a rainbow $k$-term arithmetic progression. Jungic, Licht, Mahdian, Nesetril and Radoicic conjectured $T_k = \Theta(k^2)$; Conlon, Fox and Sudakov proved $T_k = O(k^2 \log k)$. The matching lower bound $T_k = \Omega(k^2 \log k)$ holds, so $T_k = \Theta(k^2 \log k)$ and the conjectured order is wrong.
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fidelity, correctness, priority, or novelty.
What AI did
Codex (GPT-5.6), Claude Code (Fable 5)
The acknowledgement says the two systems were used for proof exploration, proof criticism, exposition and revision. Proof exploration and criticism are mathematical work rather than prose work, but no specific step is attributed, so the lowest tier applies.