pith. machine review for the scientific record. sign in
structure definition def or abbrev

RecognitionStructure

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formal statement (Lean)

  61structure RecognitionStructure (X : Type*) where
  62  /-- The recognition relation: R x y means "x recognizes y". -/
  63  recognizes : X → X → Prop
  64  /-- At least one thing can recognize itself (closure). -/
  65  has_self_recognition : ∃ x, recognizes x x
  66
  67/-- Any recognition structure implies nonemptiness. -/

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