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Mar 29, 2012 at 13:53 comment added Angelo Dear Jérôme, of course I don't mind.
Mar 29, 2012 at 13:17 history edited Angelo CC BY-SA 3.0
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Mar 29, 2012 at 9:39 comment added Jérôme Poineau I would like to add that I am sorry I cannot accept your answer too. I chose Elkies' since it was a direct and concrete answer to my question (but I believe yours could also be made concrete). I hope you do not mind. Actually I like your answer a lot even if I was rather disappointed not to have found it myself, since this was really in my line of thoughts. Indeed, I was trying to find a counterexample by trying to find a curve of degree smaller than $d^2$ in $\mathbb{P}^3$ such that the space of surfaces of degree d is a line. And that is exactly what you did. Still a long way to go...
Mar 29, 2012 at 6:29 comment added Jérôme Poineau Thank you for your answer. I guess $S_1$ refers to one of the general surfaces you choose at the beginning.
Mar 29, 2012 at 3:45 history undeleted Angelo
Mar 29, 2012 at 3:44 history edited Angelo CC BY-SA 3.0
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Mar 29, 2012 at 1:02 history deleted Angelo
Mar 29, 2012 at 0:25 comment added Angelo To Noam: oops, sorry, of course you are right.
Mar 28, 2012 at 23:51 comment added Noam D. Elkies But the component is not required to be a complete intersection of hypersurfaces of degree at most $d$. If $d=2$ then your construction gives a twisted cubic curve $C$, which is indeed cut out by quadrics, though of course not as a complete intersection.
Mar 28, 2012 at 22:15 history answered Angelo CC BY-SA 3.0