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def definition def or abbrev

contains

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formal statement (Lean)

  25def contains (I : Interval) (x : ℝ) : Prop :=

proof body

Definition body.

  26  (I.lo : ℝ) ≤ x ∧ x ≤ (I.hi : ℝ)
  27
  28/-- Point interval containing a single rational -/

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