Apa itu Konstanta Catalan?

Alternating sum 1 − 1/9 + 1/25 − … converging to G

G = 1 − 1/9 + 1/25 − 1/49 + … = Σ (−1)ⁿ/(2n+1)². The alternating series converges slowly. Whether G is irrational remains unknown.

Three equivalent forms of Catalan's constant

G = Σₙ₌₀^∞ (−1)ⁿ/(2n+1)² ≈ 0.91597…

G = ∫₀¹ arctan(t)/t dt = ∫₀^(π/2) ln(1/sin t)/2 · dt

All three expressions are equal. G muncul in combinatorics, physics, dan analysis.

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Question

Apakah konstanta Catalan berhubungan dengan bilangan Catalan?

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