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Jul 10, 2015 at 8:09 vote accept poupy
Jul 8, 2015 at 12:25 comment added Joonas Ilmavirta @poupy, sorry, my previous edit didn't make sense at all points. I revised it once more.
Jul 8, 2015 at 12:25 history edited Joonas Ilmavirta CC BY-SA 3.0
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Jul 8, 2015 at 11:12 comment added Joonas Ilmavirta @poupy, I added some details on this.
Jul 8, 2015 at 11:12 history edited Joonas Ilmavirta CC BY-SA 3.0
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Jul 8, 2015 at 10:48 comment added poupy Thanks, I'm a bit confused by the assertion "Positive semidefiniteness of II is equivalent with convexity": is it true if the surface is not smooth (in general we have a singularity at the origin)? Is there any suitable reference? Thanks again!
Jul 8, 2015 at 10:06 history answered Joonas Ilmavirta CC BY-SA 3.0