Mathematics – Geometric Topology
Scientific paper
2003-12-16
Mathematics
Geometric Topology
Scientific paper
We give an elementary proof of the fact that any orientable 3-manifold admits
a framing (i.e. is parallelizable) and any non-orientable 3-manifold admits a
projective framing. The proof uses only basic facts about immersions of
surfaces in 3-space.
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