def definition def or abbrev

`twoPowZ`

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formal statement (Lean)

  37noncomputable def twoPowZ (k : Int) : ℝ :=

Definition body.

  38  if 0 ≤ k then (2 : ℝ) ^ (Int.toNat k)
  39  else 1 / ((2 : ℝ) ^ (Int.toNat (-k)))
  40

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