Bruce Fink offers a critique in his book "Lacan to the Letter", in which he accuses Sokal and Bricmont of demanding that "serious writing" do nothing other than "convey clear meanings." Fink asserts that some concepts which Sokal and Bricmont consider arbitrary or meaningless do have roots in the history of linguistics, and that Lacan is explicitly using mathematical concepts in a metaphoric way, not claiming that his concepts are mathematically founded. He takes Sokal and Bricmont to task for elevating a disagreement with Lacan's choice of writing styles to an attack on his thought, which, in Fink's assessment, they fail to understand. Fink says that "Lacan could easily assume that his faithful seminar public...would go to the library or the bookstore and 'bone up' on at least some of his passing allusions."