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def definition def or abbrev

c_SI

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formal statement (Lean)

  54def c_SI : ℝ := 299792458

proof body

Definition body.

  55
  56/-- 1 Megaparsec in meters (IAU 2012 definition).
  57    1 pc = 648000/π AU, 1 AU = 149597870700 m (exact). -/

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