Zsqrtd.nonneg_cases

∀ {d : ℕ} {a : ℤ√↑d},
  a.Nonneg → ∃ x y, a = { re := ↑x, im := ↑y } ∨ a = { re := ↑x, im := -↑y } ∨ a = { re := -↑x, im := ↑y }

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