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Sep 20, 2014 at 14:34 vote accept Ali Taghavi
Aug 2 at 9:12
Aug 30, 2014 at 22:06 comment added Ali Taghavi Prof. Michor thank you very much for your very interesting answer and your linked references. I 'll try to learn the details of your answer.
Aug 27, 2014 at 9:50 history answered Peter Michor CC BY-SA 3.0