The story
Named after French and Belgian mathematician Eugène Charles Catalan.
Etymology from Wiktionary, CC BY-SA 4.0.
Catalan's constant
Today it means: The number G=β(2)=∑ₙ₌₀ ᪲((-1)ⁿ)/((2n+1)²)=1/(1²)-1/(3²)+1/(5²)-1/(7²)+1/(9²)-⋯, where β is the Dirichlet beta function, with a value of approximately 0.915965594177… Full definition →