 Something less ambitious than the previous attempts at a general history of human cultural productions or far-reaching parallels between art and mathematics consists in a use of the notion of style as an historiographical category in the history of mathematics without particular reference to art or other human cultural activities. If one goes back to the beginning of the twentieth century, one finds that “national styles” were often referred to for categorizing certain features characterizing mathematical production that seemed to fall squarely within national lines. In the history of science such cases of “national styles” have often been studied. One should recall here J. Harwood’s book Styles of Scientific Thought (1993) and the contributions Nye 1986, Maienschein 1991, and Elwick 2007. A case of interest for mathematics is the opposition between French and German style in mathematics studied by Herbert Mehrtens.