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Timeline for Test function .

Current License: CC BY-SA 3.0

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Sep 13, 2011 at 0:58 comment added Michael @Andrew. You are right. The condition on \eta , which I didn't include, is that it is supported in some ball B_2, identically 1 in the ball B_1 and |grad \eta| < constant.
Sep 7, 2011 at 21:33 comment added Andrew @Michael It is not valid if $\eta(x)=0$ and ${\rm grad}\eta(x)\ne0$ for some $x$.
Sep 7, 2011 at 20:52 vote accept Michael
Sep 7, 2011 at 20:36 answer added Michael Renardy timeline score: 2
Sep 7, 2011 at 20:36 comment added Andrew @Michael Does this mean $|{\rm grad}\; \eta(x)|^2 < C \eta^2(x)\;$ for all $x\in \mathbb R^n$?
Sep 7, 2011 at 20:11 history asked Michael CC BY-SA 3.0