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math.CO2026
The Sylvester--Gallai dimension of graphs
Zeev Dvir
For an undirected graph , its \emph{Sylvester--Gallai dimension} is the largest affine dimension of a configuration of distinct real points indexed by i…
math.CO2026
Rank of incidence matrices over integers modulo a prime power
Zeev Dvir
In this note we prove an upper bound on the -rank of the incidence matrix of points and hyperplanes in , improving a recent bound of Laba…