Quick Integration Question w/ "e" Hey folks, On my calc homework tonight, I have to solve the integral [tex]\int (1/e^z) dz[/tex] as part of my differential equation. Anywho, I thought the answer to that was [tex]ln (e^z) = z[/tex] but my TI-89 claims that it's really [tex]-e^-z[/tex]. Could someone please tell me which of us is correct, and more importantly, why? I was under the impression that the antiderivative of e was simply itself if there was no inner function (and since z is just a variable, I don't think there is). Thank you!