Hi everyone,

I seem to be stuck at solving the following:


Well, my solution ist: i\overset{!}<{\frac{-l\sigma^2}{2}

BUT, when I plug in l=2, l=-1, l=-2 with \sigma^2=0.04 I only get a correct solution for l=2

That is:


and therefore: i\overset{!}{<}-0.04 which corresponds to i\overset{!}<{\frac{-l\sigma^2}{2}

However, for l=-2 I should get: i\overset{!}<{\frac{-(-2)\sigma^2}{2}=\sigma^2=0.04

And here is what I do get for plugging in l=-2 in the first equation:


Then my solution is i\overset{!}{>}0.04

which is not the same as i\overset{!}{<}-0.04

What's going on here?

Thank you for your help.