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inductive definition def or abbrev

Generation

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formal statement (Lean)

  77inductive Generation where
  78  | first : Generation   -- Pattern: (0,0,*) or (1,1,*)
  79  | second : Generation  -- Pattern: (0,1,*) or (1,0,*)
  80  | third : Generation   -- Pattern: special cases
  81deriving DecidableEq, Repr
  82
  83/-- Number of generations is exactly 3. -/

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