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lemma proved term proof

half

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formal statement (Lean)

 111lemma half (φ : ℝ) : PhiClosed φ (1 / (2 : ℝ)) := by

proof body

Term-mode proof.

 112  have htwo : PhiClosed φ ((2 : ℚ) : ℝ) := of_rat φ 2
 113  simpa using inv htwo
 114
 115end PhiClosed
 116
 117/-- Universal φ-closed targets RS claims are forced to take. -/

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depends on (6)

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