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Can something be added for cases which are not (2D) spheres? Finite regions in 1, 2 and 3D space for example. otherwise title is very misleading. Melcombe (talk) 15:52, 23 February 2009 (UTC)[reply]
It would be nice, but there is a problem: it would be much too technical, I'm afraid. If you'll look at my lectures (cited in Further reading) you'll see that even in a graduate course I did not find a possibility to consider "finite regions in 1, 2 and 3D space". Of course, they are the main source of pride for the authors. However, it seems to me that Wikipedia can only inform the reader that such a theory is available, and recommend references. On the other hand, if you (or anyone) will succeed in adding something like that to the article, I'll be glad. Boris Tsirelson (talk) 19:19, 23 February 2009 (UTC)[reply]