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Jan 27, 2011 at 22:15 vote accept Vincenzo
Jan 25, 2011 at 9:34 vote accept Vincenzo
Jan 25, 2011 at 9:34
Jan 25, 2011 at 9:34 vote accept Vincenzo
Jan 25, 2011 at 9:34
Jan 24, 2011 at 10:21 comment added Vincenzo How smooth is the flow in this case? I.e. is it $C^1$? $C^2$?
Jan 24, 2011 at 10:15 vote accept Vincenzo
Jan 24, 2011 at 10:17
Jan 21, 2011 at 12:30 comment added Pengfei I mean, that is one of the examples mentioned by Michael.
Jan 21, 2011 at 12:28 comment added Pengfei See the flow in the pucture (at freeimagehosting.net/image.php?9c8be08dae.jpg). Let $X$ be the closed cornered ellipse. Then $\omega(X)$ is the union of two arcs and the center point $o$. And $\omega(\omega(X))$ consists of just three points.
Jan 21, 2011 at 10:53 history answered Michael Renardy CC BY-SA 2.5