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theorem proved term proof

partialWidth_nonneg

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formal statement (Lean)

  61theorem partialWidth_nonneg (amp phaseSpace : ℝ) (hps : 0 ≤ phaseSpace) :
  62    0 ≤ partialWidth amp phaseSpace := by

proof body

Term-mode proof.

  63  unfold partialWidth
  64  have hamp2 : 0 ≤ amp ^ 2 := sq_nonneg _
  65  exact mul_nonneg hps hamp2
  66
  67/-- Two partial widths matched when both amplitudes and phase-space factors
  68    agree. -/

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depends on (4)

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