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theorem proved term proof

eleven_check

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formal statement (Lean)

  99theorem eleven_check : (11 : ℕ) ≠ Dconfig ∧ (11 : ℕ) ≠ eightTick := by

proof body

Term-mode proof.

 100  refine ⟨?_, ?_⟩ <;> decide
 101
 102/-- 13 = F(7), a Fibonacci number (cleanly interpretable via φ-ladder). -/

depends on (6)

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