In Difference and Repetition, Gilles Deleuze employs the term in his description of "multiplicities".[5] In addition, other French writers such as Simone de Beauvoir,[6] Jacques Lacan,[7] Jacques Derrida,[citation needed] Jean-Luc Nancy,[citation needed] Alain Badiou,[8] Louis Althusser,[9] and Michel Serres[10] have made extensive use of the word 'clinamen' in their writings, albeit with very different meanings.