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structure definition def or abbrev

Physical

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formal statement (Lean)

  28structure Physical (B : BridgeData) : Prop where
  29  c_pos    : 0 < B.c
  30  hbar_pos : 0 < B.hbar
  31  G_pos    : 0 < B.G
  32
  33/-- Recognition length from anchors: λ_rec = √(ħ G / c^3). -/

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