i need to find the sup and the inf of

$\displaystyle

f(x)=1/(1+(ln x)^2 )

$

i can find the limit for the function for + infinity

and - infinity

but what to do next?

the sup is the least upper bound

the limit for +infinity is not SUP

??

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- Dec 17th 2008, 11:48 PM #1

- Joined
- Nov 2008
- Posts
- 1,401

## SUP/inf question..

i need to find the sup and the inf of

$\displaystyle

f(x)=1/(1+(ln x)^2 )

$

i can find the limit for the function for + infinity

and - infinity

but what to do next?

the sup is the least upper bound

the limit for +infinity is not SUP

??

- Dec 18th 2008, 09:05 AM #2

- Joined
- Nov 2008
- From
- France
- Posts
- 1,458