In this paper we study flows having an isolated non-saddle set. We see that the global structure of a flow having an isolated non-saddle set $ K $ depends on the way $ K $ sits in the phase space at the cohomological level. We construct flows on surfaces having isolated non-saddle sets with a prescribed global structure. We also study smooth parametrized families of flows and continuations of isolated non-saddle sets.
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Figure 2. Flow on a double torus having an isolated non-saddle set $ K' $ comprised of stationary points that is a sphere with the interiors of four closed topological disks removed. The region of influence of $ K' $ is the double torus with the fixed points $ p_1 $ and $ p_2 $ removed. $ \mathcal{I}(K')\setminus K' $ has two connected components $ C'_1 $ and $ C'_2 $ with local complexities $ 0 $ and $ 2 $ respectively
Figure 1. Flow on a double torus which has an isolated non-saddle set $ K $ comprised of stationary points that is a sphere with the interiors of four disjoint closed topological disks removed. The region of influence of $ K $ is the whole double torus and $ \mathcal{I}(K)\setminus K $ has two components $ C_1 $ and $ C_2 $ with local complexity $ 1 $
Figure 5. Flow defined on a sphere with the interior of four closed topological disks removed. This flow has a Morse decomposition $ \{M_1,M_2,M_3\} $ where $ M_1 $ is the attracting outer circle of fixed points, $ M_2 $ is the union of two topologically hyperbolic saddle fixed points and $ M_3 $ is the union of the three repelling inner circles of fixed points
Figure 8. Flow on a double torus having an isolated non-saddle set $ K'' $ whose region of influence has complexity zero but after an arbitrarily small perturbation becomes topologically equivalent to the flow depicted in Figure 2
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Flow on a double torus having an isolated non-saddle set
Flow on a double torus which has an isolated non-saddle set
Model for a degenerate saddle fixed point
Flow on
Flow defined on a sphere with the interior of four closed topological disks removed. This flow has a Morse decomposition
A sphere in
An isolated non-saddle circle which continues to a family of saddle sets which are contractible
Flow on a double torus having an isolated non-saddle set