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Jun 15, 2016 at 6:52 comment added user43326 You may want to emphasize that the condition on the orientability of $E$ is crucial here. For example, if $E=S$, the SS doesn't collapse at $E_2$.
Jun 14, 2016 at 19:20 vote accept Jesse C. McKeown
Jun 13, 2016 at 19:37 history edited Aras Ergus CC BY-SA 3.0
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Jun 13, 2016 at 18:06 history edited Aras Ergus CC BY-SA 3.0
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Jun 13, 2016 at 17:55 history answered Aras Ergus CC BY-SA 3.0