Euler's constant

(mathematics) The limit as n approaches infinity, of 1 + 1/2 + 1/3 + &cellip; + 1/n - ln n, equal to approximately 0.5772. Denoted γ. Also known as Mascheroni's constant.

mathematics Symbol C. The limit as n goes to infinity of the difference between the sum Σr^-1 for r = 1, 2, …, n and log n,
= 0.577 215 664 901 532 860 61~.