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irrational_catalanConstant

Specification

Is the Catalan constant $$G = \sum_{n=0}^∞ (-1)^n / (2n + 1)^2 \approx 0.91596$$ irrational?

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Lean 4 Statement 
theorem irrational_catalanConstant :
    answer(sorry) ↔ Irrational catalanConstant
ID: Wikipedia__Irrational__irrational_catalanConstant
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