先把linear algebra,calculus补了吧,光看课本没用,要做大量练习题,“Experience shows that one cannot learn mathematics by only reading a book or listening to the lectures. Reading and listening has to be combined with more active periods of doing exercises, solving problems, writing down a proofs, drawing schematic pictures (as a visual bridge to understanding examples and abstract concepts) and looking for counter examples (in order to understand the borderlines of a core idea). ”