F. Klein was the leader of that era. Its: the writing is very good, and many historical descriptions are full of passion, which makes people deeply moved. Few great mathematicians have written a long speech that can show the style of writing. Except Klein, Russell and Hardy: Denton really added a lot of interesting things to mathematics. There is a set of small series that are more suitable for children to read, but they are "interesting" and some are "profound". "Interesting" may be martin gardner. He wrote a lot of interesting mathematical things for magazines ... but he doesn't seem to be a mathematician. There are also some scattered sentences that touched me. I remember: Riemann's: At the beginning of Gauss's diary, I remember that he described why he suddenly stopped when he was about to bring about changes in numerical analysis methods. He said that great ideas kept popping up in his mind, but he didn't have enough energy to study and realize them one by one. It's really a pity. Mr. Yang Zhenning told the story of his early study of normal field and fiber bundle with Chen Shengshen. Mr. Qiu Chengtong has a profound background and often mentions poetry in his speeches. I remember a very touching sentence: there are so many new mathematical methods and ideas and so many profound mathematical conclusions in string theory research. If it turns out to be wrong, then I can only say that this is nature. Turing published some letters around Turing 1935, including with Newman, Church and his mother. Paul Erdos has many classic sentences and stories, which make people moved by this guy's obsession with mathematics. Think about hofstadter.