theorem proved term proof

`sigma_one_six`

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formal statement (Lean)

 980theorem sigma_one_six : sigma 1 6 = 12 := by native_decide

Term-mode proof.

 981
 982/-- σ_0(10) = 4 (divisors: 1, 2, 5, 10). -/

Lean names referenced from this declaration's body.

sigma in IndisputableMonolith.Decision.AbileneParadox decl_use
sigma in IndisputableMonolith.NumberTheory.Primes.ArithmeticFunctions decl_use