MathOverflow is a question and answer site for professional mathematicians. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Let $H_{d,g}$ denote the Hilbert scheme of curves of degree $d$ and genus $g$ locally of complete intersection in $\mathbb{P}^3$. Given a curve $C \in H_{d,g}$, denote by $S(C)$ a minimal set of generators of the ideal sheaf $I(C)$ (minimal in the sense no proper subset of $S(C)$ generate $I(C)$ as an ideal).

For a fixed integer $e>0$, is there a way of computing the maximum number of elements in $S(C)$ of degree $e$ i.e. if we impose the natural grading (by the degree of polynomial) on $S(C)$ then what is the maximal cardinality of $S(C)_e$ (where $S(C)_e$ denotes the $e$-th graded part of $S(C)$)?

share|cite|improve this question
Did you already look at Gruson-Lazarsfeld-Peskine, as suggested to you previously? – Jason Starr Aug 18 '12 at 13:26
@Starr: Which result are referring to? Is it the one that bounds the highest degree of the polynomial defining a curve! – Naga Venkata Aug 18 '12 at 17:38
"The" minimal set of generators is not well-defined. – Qiaochu Yuan Aug 18 '12 at 21:18

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.