AI agents strengthened Terence Tao's landmark Collatz theorem. For each f(N)→∞, almost every N falls below f(N) within 436 ln N steps. New: natural density and one explicit clock. Not the full conjecture. Lean-verified.

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AI agents were used to strengthen a significant result by math prodigy Terence Tao regarding the Collatz conjecture. By leveraging Lean-verified proofs, the agents helped establish a more precise 'clock' for how fast numbers decrease in this sequence. This marks a major win for AI-assisted formal verification in high-level theoretical research.