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def definition def or abbrev

c_SI

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formal statement (Lean)

  67@[simp]
  68noncomputable def c_SI : ℝ := 299792458

proof body

Definition body.

  69
  70/-- **EXTERNAL ANCHOR**: Reduced Planck constant (exact, SI 2019 definition).
  71    ℏ = 1.054571817... × 10⁻³⁴ J·s -/

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