| Mathematics | New Zealand |
| Books and course notes. | Photos of the mountain areas |
| Expository and research articles. | |
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| A representation of Grothendieck's vision of a pinned reductive group. | Mount Christina from the McKellar saddle. |
| Mountains | Other |
| Photos of the world's major mountain ranges | Photos of the West Lake Scenic Area and Huang Shan |
| TeX guide for commutative diagram packages. | |
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| Kangchenjunga 8586m/28169ft (in distance at left) and Makalu 8475m/27806ft, from the northeast ridge of Everest May 18, 2004. |
The botanical gardens, Hangzhou, after a late snowfall, March 11, 2005. |