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Jul 3, 2010 at 18:53 vote accept john mangual
Jul 3, 2010 at 18:40 answer added Greg Kuperberg timeline score: 5
Jul 3, 2010 at 18:30 answer added Sam Nead timeline score: 0
Jul 3, 2010 at 18:29 answer added Mariano Suárez-Álvarez timeline score: 0
Jul 3, 2010 at 18:22 comment added Robin Chapman What kind of function is $f$? For smooth $f$ you can get any closed subset of $\mathbb{R}^4$ as a zero set.
Jul 3, 2010 at 18:18 history asked john mangual CC BY-SA 2.5