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Apr 6, 2014 at 15:08 vote accept Siksek
Apr 6, 2014 at 15:01 answer added David E Speyer timeline score: 3
Apr 6, 2014 at 15:00 history edited Siksek
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Apr 6, 2014 at 11:12 history edited Siksek CC BY-SA 3.0
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Apr 5, 2014 at 12:58 comment added Alex Gavrilov The condition (ii) is not sufficient. Consider $f=a+(x+y^2)^2$, for example.
Apr 5, 2014 at 8:49 history edited Siksek CC BY-SA 3.0
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Apr 5, 2014 at 8:21 history asked Siksek CC BY-SA 3.0