Exact Results in Quantum Theory & Gravity

Prandtl spirals were introduced by L.Prandtl in 1922 as a model of vortices detaching from the edge of a wing. Still, their exact status was not clear till last year. In my talk I will speak about recent common result with P.Kokocki and W.S.Ozanski stating that Prandtl's spirals are weak solutions of 2d Euler.