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theorem proved term proof

angular_deficit_value

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formal statement (Lean)

 159theorem angular_deficit_value : angular_deficit_per_vertex = Real.pi / 2 := by

proof body

Term-mode proof.

 160  unfold angular_deficit_per_vertex dihedral_angle; ring
 161
 162/-- Total curvature over all 8 vertices = 4π = 2π × χ(S²).
 163    This is the Gauss-Bonnet theorem for the cube. -/

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