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Jun 2, 2015 at 5:05 vote accept GraduateStudent
Jun 1, 2015 at 3:23 comment added Qiaochu Yuan An explicit obstruction to admitting a flat connection is that, by Chern-Weil theory, all of the real Pontryagin classes must vanish.
Jun 1, 2015 at 0:10 history answered Achim Krause CC BY-SA 3.0