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theorem proved term proof

mass_difference_electromagnetic

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formal statement (Lean)

 144theorem mass_difference_electromagnetic :
 145    abs (pionMassDifference_MeV - 4.6) < 0.1 := by

proof body

Term-mode proof.

 146  simp only [pionMassDifference_MeV, pionChargedMass_MeV, pionNeutralMass_MeV]
 147  norm_num
 148
 149/-- Mass difference / (neutral mass) ≈ 3.4%. -/

depends on (4)

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