Wu's Advanced Mathematics IV is written at sixes and sevens. Although Tongji is not good, it is better than Wu.

Let me add: I have used Wu's advanced mathematics textbook for liberal arts to take classes, and the course is probability. After class, a teacher said: XXXXX is wrong. I replied: That's what Wu wrote in his book. He thundered, the book is wrong!

Of course, this exposes the essence of my poor probability and statistics. But I'm sure Wu is wrong.