theorem proved term proof

`mobius_fortytwo`

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formal statement (Lean)

1113theorem mobius_fortytwo : mobius 42 = -1 := by native_decide

Term-mode proof.

1114
1115/-- μ(70) = -1 (squarefree with 3 prime factors). -/

Lean names referenced from this declaration's body.

mobius in IndisputableMonolith.NumberTheory.Primes.ArithmeticFunctions decl_use