哈代(Godfrey Harold Hardy,1877~1947)何许人也?他是英国剑桥的数学大师,著作等身,是中国数学家华罗庚的老师。最为重要的贡献,是他发掘了印度的年轻数学天才拉马努金(Ramanujan)。拉马努金是人类历史上最伟大的数学天才,没有读过什么书,自修学数,1914年寄了一些数学文稿给哈代,哈代惊为天人,力排众议,把拉马努金邀请到剑桥去。这个近于神话式的故事今天拍成了一部很好的电影。
It is a melancholy experience for a professional mathematician to find himself writing about mathematics. The function of a mathematician is to do something, to prove new theorems, to add to mathematics, and not to talk about what he or other mathematicians have done. Statesmen despise publicists, painters despise art-critics, and physiologists, physicists, or mathematicians have usually similar feelings; there is no scorn more profound, or on the whole more justifiable, than that of the men who make for the men who explain. Exposition, criticism, appreciation, is work for second-rate minds.