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Mar 14, 2013 at 19:07 comment added Hans-Peter Stricker @Mariano: I grinned over your "few seconds" - for others it takes a few years!
Mar 14, 2013 at 19:05 comment added Hans-Peter Stricker I only begin to learn that and why orientability is crucial for my question. So excuse me for not having mentioned orientability in my original question.)
Mar 14, 2013 at 19:03 comment added Mariano Suárez-Álvarez It took me a few seconds to realize that "one plane bundle" is the same as a "Line bundle" in your first line :-)
Mar 14, 2013 at 18:57 history answered Charlie Frohman CC BY-SA 3.0