1. Nov 1, 2017 #1

   Boudy

   

   Hi there:
   I am looking for approximate expressions for the two functions: ln(x) and 1/ln(x) . Any help?
   Thanks in advance.

    

   Boudy, Nov 1, 2017
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3. Nov 1, 2017 #2

   mfb

   

   Insights Author

   2017 Award

   Staff: Mentor

   Approximations where, for what? Did you try Taylor expansions?

    

   mfb, Nov 1, 2017
4. Nov 1, 2017 #3

   mathman

   

   Science Advisor

   ln(x) is not analytic at x=0. You need to use a series around some other value. If you use the series for ln((1+x)/(1-x)) you will able to get a series for any y=(1+x)/(1-x) for -1<x<1.

    

   mathman, Nov 1, 2017

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