Subcritical polynomial and supercritical sine-Gordon flows with tetrahedral symmetry are formally stable while subcritical sinh-Gordon and supercritical Liouville flows are unstable in the 2D Euler equations on the sphere.
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Formal Stability of Tetrahedral Non-Zonal Flows on the Sphere
Subcritical polynomial and supercritical sine-Gordon flows with tetrahedral symmetry are formally stable while subcritical sinh-Gordon and supercritical Liouville flows are unstable in the 2D Euler equations on the sphere.