changes.mady.by.user Arthur Aslanyan (Nafta College)
Saved on Mar 09, 2019
...
There is a trend to moving from
Image Added
Fig. 1. A sample graph of
{\rm Ei}(x) = \gamma + \ln |x| + \sum_{k=1}^\infty \frac{x^k}{k\cdot k!}
{\rm Ei}(x) = e^x \, \left[ \frac{1}{x} + \sum_{k=2}^\infty \frac{(k-1)!}{x^k} \right]
where
{\rm Ei}(-x) \sim \gamma + \ln x
{\rm Ei}(x) \sim \gamma + \ln x