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Series are of different types. For small values of x we use Taylor series. For large values we use Asymptotic expansions and Series that are expanded around infinity.
http://numbers.computation.free.fr/Cons … rimes.html
now you will understand why there are only approximate answers.
I just want to know how to find li(x),but you could show an example of your own.
Yes, but first I need that information from you.
Could you show me some
Depends on the arguments or how much accuracy you need. There are several ways for each.
That series is a little complex,isn't there a easier way?
You can use the series given at http://en.wikipedia.org/wiki/Logarithmi … esentation
What is li(x)?I know it is logarithmic integral function,but how do i find li(x),for instance,what will be li(5)?