Smooth 2D Euler steady states with multiple critical points can be perturbed to make vorticity non-functional in the stream function, yielding isolated branches of stable states unlike the analytic case.
Nonlinear instability of ideal plane flows.International Mathematics Research Notices, 2004(41):2147–2178
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On the flexibility of 2D Euler steady states
Smooth 2D Euler steady states with multiple critical points can be perturbed to make vorticity non-functional in the stream function, yielding isolated branches of stable states unlike the analytic case.