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def definition def or abbrev

zeroDeviationSet

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formal statement (Lean)

  38def zeroDeviationSet (Ξ : CompletedXiSurface) : Set ℝ :=

proof body

Definition body.

  39  { t : ℝ | ∃ s : ℂ, Ξ.xi s = 0 ∧ zeroDeviation s = t }
  40
  41/-- The set of zero defects realized by zeros of a completed-ξ surface. -/

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