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Mar 22, 2010 at 11:46 comment added Tommaso Centeleghe I do not know if it is true that the normal bundle of a closed, connected surface in R^3 is trivial. It seems to agree with what Sam Nead says below. I will try to inquiry this!
Mar 22, 2010 at 11:18 comment added Don Stanley I mean without using some characteristic class theory ...
Mar 22, 2010 at 11:14 comment added Don Stanley How do you prove the normal bundle is trivial?
Mar 22, 2010 at 11:12 history answered Tommaso Centeleghe CC BY-SA 2.5