LaTeX.org

Thank you, I fixed the problem by using the amsmidx package instead. As you have mentioned, index.sty has problems with AMS classes (I'm using amsbook).

I'm having a problem with index.sty, which allows me to create multiple indices. Whenever I use it, there are errors in \tableofcontents. I think this is because the index.sty redefines certain things in the table of contents. Is there any way around this?