 In "Intellectual Impostures" (1997), physics professors Alan Sokal and Jean Bricmont devote a chapter to Kristeva's use of mathematics in her writings.They argue that Kristeva fails to show the relevance of the mathematical concepts she discusses to linguistics and the other fields she studies, and that no such relevance exists.In 2018, Bulgaria's state Dossier Commission announced that Kristeva had been an agent for the Committee for State Security under the code name "Sabina".