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formal statement (Lean)
2143theorem practical_eighteen : sigma 1 18 ≥ 18 := by native_decide
proof body
Term-mode proof.
2144
2145/-- σ_1(20) = 42 ≥ 20, so 20 is practical. -/
depends on (6)
Lean names referenced from this declaration's body.
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sigma
in IndisputableMonolith.Decision.AbileneParadox
decl_use
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is
in IndisputableMonolith.Foundation.OptionAEmpiricalProgram
decl_use
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is
in IndisputableMonolith.Foundation.SimplicialLedger.EdgeLengthFromPsi
decl_use
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is
in IndisputableMonolith.GameTheory.MechanismDesignFromSigma
decl_use
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is
in IndisputableMonolith.Mathematics.RamanujanBridge.MockThetaPhantom
decl_use
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sigma
in IndisputableMonolith.NumberTheory.Primes.ArithmeticFunctions
decl_use