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lemma proved term proof

mul

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formal statement (Lean)

  85lemma mul (hx : PhiClosed φ x) (hy : PhiClosed φ y) :
  86    PhiClosed φ (x * y) :=

proof body

Term-mode proof.

  87  (phiSubfield φ).mul_mem hx hy
  88

used by (40)

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depends on (5)

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