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def definition def or abbrev

fourPiIntervalTight

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formal statement (Lean)

 199def fourPiIntervalTight : Interval where
 200  lo := 12566368 / 1000000  -- 12.566368

proof body

Definition body.

 201  hi := 12566372 / 1000000  -- 12.566372
 202  valid := by norm_num
 203
 204/-- 4π is contained in fourPiIntervalTight - PROVEN -/

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