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Aug 2 at 9:12 vote accept Ali Taghavi
Nov 9, 2019 at 15:46 history edited Robert Bryant CC BY-SA 4.0
Corrected a theorem attribution and added some references.
Aug 30, 2014 at 22:03 comment added Ali Taghavi Prof Bryant Thank you very much for your answer. I 'll try to learn about Godbillon Vey class and its dynamic and geometric meaning.
Aug 27, 2014 at 12:03 history answered Robert Bryant CC BY-SA 3.0