Geodesic
On $n$-node lines in $GC_n$ sets
Proceedings of the Yerevan State University. Physical and mathematical sciences, Tome 55 (2021) no. 1, pp. 44-55

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An $n$-poised node set $\mathcal {X}$ in the plane is called $GC_n$ set, if the fundamental polynomial of each node is a product of linear factors. A line is called $k$-node line, if it passes through exactly $k$-nodes of $\mathcal {X}$ At most $n+1$ nodes can be collinear in $\mathcal {X}$ set and an $(n+1)$-node line is called maximal line. The well-known conjecture of M. Gasca and J.I. Maeztu states that every $GC_n$ set has a maximal line. Until now the conjecture has been proved only for the cases $n \le 5.$ In this paper we prove some results concerning $n$-node lines, assuming that the Gasca–Maeztu conjecture is true.
Keywords: $n$-poised set, $GC_n$ set
Mots-clés : polynomial interpolation, Gasca–Maeztu conjecture, maximal line, $n$-node line. 
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G. K. Vardanyan. On $n$-node lines in $GC_n$ sets. Proceedings of the Yerevan State University. Physical and mathematical sciences, Tome 55 (2021) no. 1, pp. 44-55. http://geodesic.mathdoc.fr/item/UZERU_2021_55_1_a5/