> His books on differential equations and classical mechanics are simply the best. I'm partial to his Topological Methods in Hydrodynamics myself. In case you

> His books on differential equations and classical mechanics are simply the best. I'm partial to his Topological Methods in Hydrodynamics myself. In case you're a "school child" interested in mathematics, the lecture he mentioned, The Abel theorem in problems, was just recently translated into english by Sujit Nair. http://www.cds.caltech.edu/~nair/abel.pdf http://www.cds.caltech.edu/~nair/abel.pdf