Number theory, number theory... (like, very theoretical and cool maths, see the sum of generators in p thread in ee2)
Logic... LOGIC! (final proof: you can't prove all mathematical truths)
Some other subject which you derive all the laws of physics from a principle that all things move to the laziest phase (or something to that effect).
go pick up a 2nd year and 3rd year maths booklet. THAT is tsp maths.