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Dec 16, 2019 at 22:17 comment added Gerardo Arizmendi Are there some groups which action is always conjugate to a linear action in $\mathbb R^4$? Which ones?
Apr 30, 2010 at 0:35 comment added Allan Edmonds @Pete: Ah-hah! My copy of Hempel. Every few years I find myself looking for it for some reason and wondering what became of it. It's not a big deal. If you really aren't using it, then maybe send it along sometime. I've enjoyed reading many of your comments here on MO.
Apr 29, 2010 at 22:49 comment added sara @Prof.Edmonds:But aren't there some important papers that deals with this topic and then give the results one after another?I want to trace the history of this problem.
Apr 29, 2010 at 18:46 comment added Pete L. Clark @Professor AE: Speaking of 3-manifolds, I have a book by that name which I believe you lent to me. I haven't finished it yet, but after 13 years I am beginning to think that it may take me a little while to get to it. Would you like it back?
Apr 29, 2010 at 15:43 comment added Allan Edmonds This a vast subject. Are you most interested in the low-dimensional cases? Or the high-dimensional cases? Especially interested in the non-compact case, as compared to actions on S^n? Especially interested in aspects unique to smoothness? As a starter you might try to check out Bredon's book, Introduction to Compact Transformation Groups, and some constructions in Chapter I, Secs. 7-8.
Apr 29, 2010 at 13:11 comment added sara Prof.Edmonds,Thank you so much for your answer.It is helpful.May I know where i can find these results and the arguments.Thank you!
Apr 29, 2010 at 12:34 history answered Allan Edmonds CC BY-SA 2.5