※ Zoom 회의 병행 https://snu-ac-kr.zoom.us/j/86561055957?pwd=UGEvajVpK3BGenNaZFpGUmtuTVFBUT09 회의 ID: 865 6105 5957 암호: 716477 We obtain a quantitative and robust proof that incompressible fluid models are strongly ill-posed in critical Sobolev spaces, in the sense that norm inflation and even nonexistence occur for critical initial data. We then show how to use the result to obtain short-time enhanced dissipation for the Navier-Stokes equations.