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Zero-dimensional complete intersections and their linear span in the Veronese embeddings of projective spaces
Arabian Journal of Mathematics Pub Date : 2018-08-24 , DOI: 10.1007/s40065-018-0221-9
Edoardo Ballico

Let \(\nu _{d,n}: \mathbb {P}^n\rightarrow \mathbb {P}^r\), \(r=\left( {\begin{array}{c}n+d\\ n\end{array}}\right) \), be the order d Veronese embedding. For any \(d_n\ge \cdots \ge d_1>0\) let \(\check{\eta }(n,d;d_1,\ldots ,d_n)\subseteq \mathbb {P}^r\) be the union of all linear spans of \(\nu _{d,n}(S)\) where \(S\subset \mathbb {P}^n\) is a finite set which is the complete intersection of hypersurfaces of degree \(d_1, \dots ,d_n\). For any \(q\in \check{\eta }(n,d;d_1,\ldots ,d_n)\), we prove the uniqueness of the set \(\nu _{d,n}(S)\) if \(d\ge d_1+\cdots +d_{n-1}+2d_n-n\) and q is not spanned by a proper subset of \(\nu _{d,n}(S)\). We compute \(\dim \check{\eta }(2,d;d_1,d_1)\) when \(d\ge 2d_1\).


中文翻译:

投影空间的Veronese嵌入中的零维完整交点及其线性跨度

\(\ nu _ {d,n}:\ mathbb {P} ^ n \ rightarrow \ mathbb {P} ^ r \)\(r = \ left({\ begin {array} {c} n + d \\ñ\ {端阵列}} \右)\) ,是顺序d维罗纳嵌入。对于任何\(d_n \ ge \ cdots \ ge d_1> 0 \),\(\ check {\ eta}(n,d; d_1,\ ldots,d_n)\ subseteq \ mathbb {P} ^ r \)为的所有线性跨度的联合\(\ NU _ {d,N}(S)\)其中\(S \子集\ mathbb {P} ^ N \)是一个有限集合,其是度的超曲面的完整相交\ (d_1,\ dots,d_n \)。对于任何\(q \ in \ check {\ eta}(n,d; d_1,\ ldots,d_n)\),我们证明了集合\(\ nu _ {d,n}(S)\)的唯一性如果\(d \ ge d_1 + \ cdots + d_ {n-1} + 2d_n-n \)并且q没有被\(\ nu _ {d,n}(S)\)的适当子集所覆盖。当\(d \ ge 2d_1 \)我们计算\(\ dim \ check {\ eta}(2,d; d_1,d_1)\)
更新日期:2018-08-24
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