Skip to main content
7 events
when toggle format what by license comment
Sep 11, 2017 at 11:23 history edited Joseph O'Rourke CC BY-SA 3.0
Image link broken; now fixed.
Apr 27, 2012 at 6:45 comment added Ryan Budney Okay, then you're looking at the causal structure on the plane minus the zeros of the vector field / Lorentz structure.
Apr 27, 2012 at 1:47 answer added TerronaBell timeline score: 5
Apr 26, 2012 at 21:34 comment added Joseph O'Rourke @Ryan: Thanks for the "Lorentz structure" hint; that connection did not occur to me.
Apr 26, 2012 at 21:31 comment added Joseph O'Rourke @Ryan: Good question! I must allow zeros, for rotations about a point are among my vector fields. I guess then $u(p)$ must also be zero: the particle stops and stays there.
Apr 26, 2012 at 21:21 comment added Ryan Budney What should your constraint mean at a zero of the vector field? If you don't allow zeros, I'd say you have a Lorentz structure on the plane, and you're asking about the causal relationships between points.
Apr 26, 2012 at 21:18 history asked Joseph O'Rourke CC BY-SA 3.0