Need Aproximate expressions for : ln(x) and 1/ln(x) Thanks

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

Answers and Replies

  • #2
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Approximations where, for what? Did you try Taylor expansions?
 
  • #3
mathman
Science Advisor
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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.
 

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