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structure definition def or abbrev

ZeroFreeRegion

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formal statement (Lean)

  43structure ZeroFreeRegion where
  44  width : ℝ → ℝ  -- width of zero-free strip as function of height
  45  width_pos : ∀ t, 1 < t → 0 < width t
  46  width_decreasing : ∀ t₁ t₂, 1 < t₁ → t₁ < t₂ → width t₂ ≤ width t₁
  47

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