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Feb 28, 2012 at 11:00 vote accept Igor Khavkine
Feb 28, 2012 at 11:00 history bounty ended Igor Khavkine
Feb 28, 2012 at 11:00 comment added Igor Khavkine Willie, that's for the answer! I had the feeling that the equality of the geometric and analytical domains of influence/dependence was probably too good to be true. I'm basically happy to learn of the relevant PDE lingo that can be seen as addressing the difference between the two. From your answer and from looking through the literature, I see that the main relevant key words are indeed lacunae and geometric optics. I'll accept this answer. And thanks for the references.
Feb 24, 2012 at 16:39 history answered Willie Wong CC BY-SA 3.0