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theorem proved term proof

stringTension_pos

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formal statement (Lean)

  42theorem stringTension_pos : 0 < stringTension := by

proof body

Term-mode proof.

  43  unfold stringTension
  44  exact zpow_pos phi_pos _
  45
  46/-- φ^5 is between 10 and 12 (using bounds on φ). -/

used by (3)

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depends on (7)

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