Bulletin of the RAS, Volume 72, N3, 245-250, 2002. — 6 s. On duel B. and . Arnold was called by J. -P. Serr, who motivated his challenge this way: "I want to talk about Bourbaki's influence on mathematics. But if everyone says the same thing, and even panegorically, it will be boring. So I began to look for someone who could express the most opposite opinion .. And, turning over the directory of mathematicians of the world, I realized that it was you. The duel took place on March 13, 2001. the Institute A. Punkare . Each participant spoke for an hour. The article is devoted to the description of this discussion.