k-nets embedded in a projective plane over a field

• DOI: 10.1007/s00493-011-3055-z
• Publication Date: 2014-06-26T11:51:51Z
• Authors: Gábor Korchmáros; Gábor P. Nagy; Nicola Pace
• Keywords: Mathematics - Algebraic Geometry; QA Mathematics / matematika; 01.01. Matematika; FOS: Mathematics; k-net; projective plane; Algebraic Geometry (math.AG)

We investigate $k$-nets with $k\geq 4$ embedded in the projective plane $PG(2,\mathbb{K})$ defined over a field $\mathbb{K}$; they are line configurations in $PG(2,\mathbb{K})$ consisting of $k$ pairwise disjoint line-sets, called components, such that any two lines from distinct families are concurrent with exactly one line from each component. The size of each component of a $k$-net is the same, the order of the $k$-net. If $\mathbb{K}$ has zero characteristic, no embedded $k$-net for $k\geq 5$ exists; see [1,2]. Here we prove that this holds true in positive characteristic $p$ as long as $p$ is sufficiently large compared with the order of the $k$-net. Our approach, different from that used in [1,2], also provides a new proof in characteristic zero. [1] J. Stipins, Old and new examples of k-nets in P2, math.AG/0701046. [2] S. Yuzvinsky, A new bound on the number of special fibers in a pencil of curves, Proc. Amer. Math. Soc. 137 (2009), 1641-1648.<br/>13 pages<br/>