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structure definition def or abbrev

Hinge

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formal statement (Lean)

 163structure Hinge (_L : SimplicialLedger.SimplicialLedger) where
 164  deficit : ℝ
 165
 166/-- A *codimension-0 or codimension-1* stratum of the ledger: the
 167    3-simplex interior or a 2-face shared between two simplices.
 168    Neither carries curvature by the flat-interior axiom. -/

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