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theorem proved term proof

mobius_isMultiplicative

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formal statement (Lean)

 166theorem mobius_isMultiplicative : ArithmeticFunction.IsMultiplicative mobius := by

proof body

Term-mode proof.

 167  simp only [mobius]
 168  exact ArithmeticFunction.isMultiplicative_moebius
 169
 170/-! ### Sigma function (sum of divisors) -/
 171
 172/-- The sum-of-divisors function σ_k. -/

depends on (6)

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