I believe people should be able to have pretty much any book (not software) at their disposal when doing university level math exams. It is stupid to fail because your overworked brain forgot some formula (did not happen to me, but easily could). And people who did not study beforehand will not be able to cheat their way through, at least not in the time limit needed.

This isn't paramedic training where you need to do the right thing in seconds.