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c_2_lower

Specification

Lower bound for $c(2)$ from Green's first paper ([Gr01]); the constant is `sqrt(4/7)` (about 0.7559).

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Lean 4 Statement 
theorem c_2_lower : ENNReal.ofReal (Real.sqrt (4 / 7)) ≤ c 2
ID: GreensOpenProblems__35__c_2_lower
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