gamma = 
= 0.5772156649 0153286061 ...
= lim (n->
)
( 1 + 1/2 + 1/3 + 1/4 + ... + 1/n - ln(n) ) = 0.5772156649...
= - 
e^-x ln x dx
' (1) = -
(see Gamma Function)
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