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lemma proved term proof

self

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formal statement (Lean)

  60lemma self (φ : ℝ) : PhiClosed φ φ := by

proof body

Term-mode proof.

  61  change φ ∈ phiSubfield φ
  62  exact Subfield.subset_closure (by simp)
  63

used by (40)

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depends on (2)

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