What's the motivation behind Hazo's quest for math books? Is it because it's just good to know math generally, or because understanding noncontinuous n-dimensional algebraic manifolds triggers a certain exploit, or is it an investment in plausible deniability before he's struck by divine inspiration and invents the last 300 years of the field? If math writing's just too rare (or, since I'm pretty sure he didn't finish The History of the Elemental Nations Vol. 1, Hazo's life isn't conducive to leisurely reading), why not ask Kagome if he knows anything advanced?