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def definition def or abbrev

ballP

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formal statement (Lean)

  18def ballP {α : Type} (K : Kinematics α) (x : α) : Nat → α → Prop
  19| 0, y => y = x
  20| Nat.succ n, y => ballP K x n y ∨ ∃ z, ballP K x n z ∧ K.step z y
  21
  22namespace ConeBound
  23
  24variable {α : Type} {d : Nat}
  25variable [DecidableEq α]
  26variable [B : BoundedStep α d]
  27

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