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theorem proved term proof

proportionCost_nonneg

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formal statement (Lean)

  57theorem proportionCost_nonneg (a i : ℝ) (ha : 0 < a) (hi : 0 < i) :
  58    0 ≤ proportionCost a i := by

proof body

Term-mode proof.

  59  unfold proportionCost; exact Jcost_nonneg (div_pos ha hi)
  60
  61/-- The φ:1 rectangle is in the aesthetic preference band (1.4, 1.9). -/

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