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Jun 25, 2013 at 16:09 comment added Italo I allow $X$ to be normal with isolated singular points
Jun 25, 2013 at 16:05 comment added Olivier Benoist If $X$ is smooth, there is no non-trivial vector fields unless $X$ is a quadric or a plane cubic : see for instance mathoverflow.net/questions/10743/… .
Jun 25, 2013 at 15:59 history asked Italo CC BY-SA 3.0