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lemma proved term proof

sub

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formal statement (Lean)

  78lemma sub (hx : PhiClosed φ x) (hy : PhiClosed φ y) :
  79    PhiClosed φ (x - y) :=

proof body

Term-mode proof.

  80  (phiSubfield φ).sub_mem hx hy
  81

used by (40)

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depends on (3)

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