12 “Average reader” is kind of a synecdoche for “people who read mainly for diversion or entertainment.” These people are American genre fiction’s basic audience. It is true that Hardy’s Apology, as well as novels from Don DeLillo’s Ratner’s Star and Thomas Pynchon’s Gravity’s Rainbow to Neal Stephenson’s Cryptonomicon have already deployed higher math in interesting and significant ways—but books like these are belle lettres, literature, for which the audience is, again, usually small and rather specialized. Genre books are mass books and are marketed accordingly.