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def definition def or abbrev

ballP

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formal statement (Lean)

  10def ballP (K : Kinematics α) (x : α) : Nat → α → Prop
  11| 0, y => y = x
  12| Nat.succ n, y => ballP K x n y ∨ ∃ z, ballP K x n z ∧ K.step z y
  13

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