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def definition def or abbrev

phiRung

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formal statement (Lean)

  69def phiRung (n : ℕ) : ℤ :=

proof body

Definition body.

  70  (Nat.factorization n).sum (fun p k => k * phiRungPrime p)
  71
  72/-- `phiRung(1) = 0` (the empty product). -/

used by (22)

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depends on (4)

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