Ideas for the Maths Library needed

I am preparing to code the Math library. It will be compatible with the Persistence Library (Optionally including << and >> operators to work with Persistence Engines if you have libPersist++ installed on your system) However I need some ideas as to what people would like to see.

I was thinking about Random numbers, 2D and 3D Vector ops, Complex number ops - and anything else people come up with