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Can someone please explain glueing two oriented manifolds along a common boundary but with opposite orientations. What happens at the boundary? Which orientation do we keep? Please suggest some good references.

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 Sorry, you're asking this question on the wrong forum. math.stackexchange.com is more appropriate, and I believe your question already appears there math.stackexchange.com/questions/20357/… – Ryan Budney May 23 2011 at 19:44
Ryan, I understand the differential case and the topological case in general. My question was about topological manifolds with boundary and orientation on them. What I am really asking about is some \textbf{good reference} that contains induced orientation on the boundary and gluing.. Thanks. – Neha May 25 2011 at 10:35

closed as off topic by Ryan Budney, André Henriques, Andy Putman, Qiaochu Yuan, Zev Chonoles May 23 2011 at 21:19

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