def definition def or abbrev

`extractNeighborhood`

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formal statement (Lean)

  64noncomputable def extractNeighborhood (tape : Tape) (i : ℤ) : Neighborhood :=

Definition body.

  65  { left := tape (i - 1)
  66  , center := tape i
  67  , right := tape (i + 1) }
  68
  69/-- The local update rule -/

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Lean names referenced from this declaration's body.