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The extant letters exchanged between Kervaire and Milnor during their collaboration from 1958–1961 concerned their work on the classification of exotic spheres, culminating in their 1963  Annals of Mathematics  paper. Michel Kervaire died in 2007; for an account of his life, see the obituary by Shalom Eliahou, Pierre de la Harpe, Jean-Claude Hausmann, and Claude Weber in the September 2008 issue of the  Notices of the American Mathematical Society . The letters were made public at the 2009 Kervaire Memorial Conference in Geneva. Their publication in this issue of the  Bulletin of the American Mathematical Society  is preceded by our commentary on these letters, providing some historical background.

Commentary on the Kervaire–Milnor correspondence 1958–1961