"... But it is true that Descartes hated Fermat, who corrected him more than once. In the standard recent biography, Stephen Gaukcroker quotes a letter from Descartes to Mersenne which describes the work of Fermat as "shit." S. Gaukroger, Descartes. An Intellectual Biography, Oxford:Clarendon Press, p. 323. The reader is referred to the 2nd edition of Adam & Tannery's Works of Descartes, Paris, 1974-1986, vol. 2, pp. 463-464."
(из письма в рассылку, посвящённую истории математики)