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theorem proved tactic proof

phi5_eq

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formal statement (Lean)

  33theorem phi5_eq : phi ^ 5 = 5 * phi + 3 := by

proof body

Tactic-mode proof.

  34  have h2 := phi_sq_eq
  35  have h3 : phi ^ 3 = 2 * phi + 1 := by nlinarith
  36  have h4 : phi ^ 4 = 3 * phi + 2 := by nlinarith
  37  nlinarith
  38

used by (14)

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depends on (6)

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