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def definition def or abbrev

phiSubfield

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formal statement (Lean)

  47def phiSubfield (φ : ℝ) : Subfield ℝ :=

proof body

Definition body.

  48  Subfield.closure ({φ} : Set ℝ)
  49
  50/-- The value `x` is algebraic over the subfield generated by `φ` using field
  51operations. -/

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