Catalan's constant
词源说明
Named after French and Belgian mathematician Eugène Charles Catalan.
释义（英文）
专有名词 Proper noun
- (mathematics) The number G=β(2)=∑n=0∞(−1)n(2n+1)2=112−132+152−172+192−⋯, where β is the Dirichlet beta function, with a value of approximately 0.915965594177…