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theorem proved term proof

Q3_aut_order

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formal statement (Lean)

 105theorem Q3_aut_order : aut_order 3 = 48 := by norm_num [aut_order, Nat.factorial]

proof body

Term-mode proof.

 106
 107/-- Euler characteristic of the Q₃ surface: V + F = E + 2 (sphere).
 108    Written as V + F = E + 2 to avoid natural subtraction underflow. -/

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