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def definition def or abbrev

planck_radiance

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formal statement (Lean)

  98noncomputable def planck_radiance (ν T : ℝ) : ℝ :=

proof body

Definition body.

  99  2 * ν ^ 3 / (Real.exp (ν / T) - 1)   -- in natural units hbar=c=kB=1
 100
 101/-- Planck spectrum is positive for T > 0, ν > 0. -/

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