P78 unit sphere 和 unit ball还是不要都翻译成“单位球”吧...不过前面的unit circle和unit disc倒是区分开了
My research is in algebraic and differential geometry and, recently, in number theory. In particular, I have been concerned with the Hermite problem (which asks for generalizations of continued fractions). I was an undergraduate at the University of Texas at Austin, a graduate student at Brown and an Evans Instructor at Rice before coming to Williams in 1989. I spent the academic year of 1992-93 on sabbatical at the University of Washington and the academic year of 2000-01 at the University of Michigan, Ann Arbor and will be returning to Michigan for 2012-13.