qbranch wrote:I intend to study German for use with number theory. At most schools, there is a course you can take specifically designed towards readiing for research (though not specifically for the mathematics discipline). Also, I don't think any of the grad students I have talked to take it very seriously. They all say that you can get by with very minimal preparation. I still think that it would be extremely useful, so if I have time, I plan to take the course.
For number theory I definitely recommend French as a lot of major recent advances in number theory from Weil and co are in French.