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def definition def or abbrev

neg

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formal statement (Lean)

  66def neg (I : Interval) : Interval where
  67  lo := -I.hi

proof body

Definition body.

  68  hi := -I.lo
  69  valid := neg_le_neg I.valid
  70
  71instance : Neg Interval where
  72  neg := neg
  73

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depends on (6)

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