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theorem proved term proof

fib_values

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formal statement (Lean)

  44theorem fib_values :
  45    Nat.fib 1 = 1 ∧ Nat.fib 2 = 1 ∧ Nat.fib 3 = 2 ∧ Nat.fib 4 = 3 ∧
  46    Nat.fib 5 = 5 ∧ Nat.fib 6 = 8 ∧ Nat.fib 7 = 13 ∧ Nat.fib 8 = 21 ∧
  47    Nat.fib 9 = 34 ∧ Nat.fib 10 = 55 ∧ Nat.fib 11 = 89 := by

proof body

Term-mode proof.

  48  refine ⟨rfl, rfl, rfl, rfl, rfl, rfl, rfl, rfl, rfl, rfl, rfl⟩
  49
  50/-- Universal Fibonacci-phi identity by induction. -/

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