As far as the current IT workplace environment is concerned, anyone who wants to go further and do any innovative technology often cannot escape mathematics. Whether it is data structure and algorithm, or program design, the underlying principles and ideas are derived from mathematics. Learning mathematics well in the era of big data and intelligence is itself a threshold. I have read a lot of mathematical materials on the market, which are either too difficult or too abstract and can not be explained in easy-to-understand language. The basic course of mathematics for programmers is one of them. After learning, let me connect the algorithm with the mathematical model in series, and also clean up some previous blind spots. I must brush it two or three times when I have time.