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Improper intergral

Posted 11 years ago

Hi, I'm trying to compute the following improper integral: exp(-x)/Log(x) at the [2,+inf) interval and it returns me that it's not converges. But this integral should converge, as I see it by comparison test with exp(-x). Can somebody explain me what's wrong here?

Code: Integrate[1/(E^x*Log[x]), {x, 2, [Infinity]}] thanks

POSTED BY: Sasha ros
3 Replies
Posted 11 years ago

I got it, thanks for your help

POSTED BY: Sasha ros
POSTED BY: Sean Clarke
Posted 11 years ago

Use NIntegrate;

In[56]:= NIntegrate[1/(E^x*Log[x]), {x, 2, \[Infinity]}]

Out[56]= 0.136743

This integral is indeed converging as can be seen from:

Plot[NIntegrate[1/(E^x*Log[x]), {x, 2, upper}], {upper, 2, 10}]

enter image description here

POSTED BY: Erik Mahieu
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