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when toggle format what by license comment
Sep 14, 2014 at 4:28 history edited David Z CC BY-SA 3.0
edited title and improved math formatting
Sep 13, 2014 at 23:52 comment added DanielSank Added an alternative approach to the problem to my answer.
Sep 13, 2014 at 22:22 vote accept got it--thanks
Sep 13, 2014 at 22:18 answer added DanielSank timeline score: 9
Sep 13, 2014 at 21:36 comment added higgsss Hint: $\epsilon \cdot \nabla = \sum_{j} \epsilon_{j} \frac{\partial}{\partial x_{j}}$.
Sep 13, 2014 at 21:32 history edited Qmechanic CC BY-SA 3.0
deleted 29 characters in body; edited tags
Sep 13, 2014 at 21:31 history asked got it--thanks CC BY-SA 3.0