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structure definition def or abbrev

InitialConditions

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formal statement (Lean)

  37structure InitialConditions where
  38  position : Fin 4 → ℝ  -- x^μ(0)
  39  direction : Fin 4 → ℝ  -- k^μ = dx^μ/dλ|_{λ=0}
  40  -- Null condition will be enforced by geodesic structure
  41

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