Mathematics – Dynamical Systems
Scientific paper
2003-03-25
Mathematics
Dynamical Systems
16 pages, 6 figures
Scientific paper
Generically, the set of points along which two non-singular vector fields on the three-sphere are positively (resp. negatively) collinear form a link. We prove that the two vector fields are homotopic if and only if the linking number of those links is zero. We use this criterion to give a new proof of a result of Yano: every non-singular vector field on the three-sphere is homotopic to a non-singular Morse-Smale vector field.
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