theorem proved term proof

`D2_fails_sync`

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formal statement (Lean)

 411theorem D2_fails_sync : Nat.lcm (2 ^ 2) 45 ≠ 360 := by native_decide

Term-mode proof.

 412
 413/-- **THEOREM**: D = 4 fails (lcm(16,45) = 720 ≠ 360). -/