theorem proved term proof

`sigma_zero_twelve`

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formal statement (Lean)

 989theorem sigma_zero_twelve : sigma 0 12 = 6 := by native_decide

Term-mode proof.

 990
 991/-- σ_1(12) = 28 (sum: 1 + 2 + 3 + 4 + 6 + 12 = 28). -/

Lean names referenced from this declaration's body.

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