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structure definition def or abbrev

MetricTensor

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formal statement (Lean)

  39structure MetricTensor where
  40  g : Idx → Idx → ℝ
  41  symmetric : ∀ mu nu, g mu nu = g nu mu
  42
  43/-- The inverse metric g^{mu nu} (satisfying g^{mu rho} g_{rho nu} = delta^mu_nu). -/

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