Instability and nonuniqueness for the $2d$ Euler equations in vorticity form, after M. Vishik

Dallas Albritton, Elia Brué, Maria Colombo +4

In this expository work, we present Vishik's theorem on non-unique weak solutions to the two-dimensional Euler equations on the whole space, \[ \partial_t ω+ u \cdot \nabla ω= f \,…