Instability and nonuniqueness for the 2d Euler equations in vorticity form, after M. Vishik.
Nonuniqueness_Euler_v2.pdf (905.52 KB)
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2021. 
Positive solutions of transport equations and classical nonuniqueness of characteristic curves. Arch. Ration. Mech. Anal. . 240(2):1055-1090.
nonunique-flow-20.pdf (398.69 KB)
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2021. 
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