Tuza's Conjecture for Maximum Degree at Most Seven
partialconfidence 70%
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Precise statement
Tuza conjectured that every finite simple graph satisfies $\tau(G) \leq 2\nu(G)$, where $\nu$ counts pairwise edge-disjoint triangles and $\tau$ is the fewest edges whose deletion leaves the graph triangle-free. Puleo had proved it for maximum average degree below 7. Proved here for every graph of maximum degree at most seven, crossing the equality boundary of Puleo's sparsity theorem.
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fidelity, correctness, priority, or novelty.
What AI did
Claude Code (Claude 5 family), OpenAI Codex (GPT-5.6 family)
Both were "used extensively for proof exploration, software development, exact computational checks, literature discovery, and drafting and editing the manuscript", with the author selecting the arguments and methods and checking the sources and computations. Broad rather than step-attributed, so the lower tier applies.
A preprint days old with no independent review. A certificate catalogue and verification programs ship as ancillary files and in a companion repository, so the computational part is reproducible.