Re: case by case analysis

The use of "for" and "and" is correct but $\displaystyle <0, <0, \geq 0$ should be the number(s) that E[I] takes under the conditions described.

Re: case by case analysis

Thanks for your help. All I want to say is that E[I] will be less than one if one of the first two conditions is met. I don't really want and I also can't specify the value that E[I] takes, because it depends on other variables like i and sigma etc. I really only want to point out, that there are two cases in which E[I] becomes negative, otherwise positiv. If I have managed to do that with the above, then I am happy enough;)