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lemma proved term proof

phiRung_add

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formal statement (Lean)

 168lemma phiRung_add (m n : ℤ) : phiRung (m + n) = phiRung m * phiRung n := by

proof body

Term-mode proof.

 169  simp only [phiRung]
 170  exact zpow_add₀ phi_ne_zero m n
 171

depends on (6)

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