On sets of points with few odd secants

22 Jul 2019  ·  Ball Simeon, Csajbók Bence ·

We prove that, for $q$ odd, a set of $q+2$ points in the projective plane over the field with $q$ elements has at least $2q-c$ odd secants, where $c$ is a constant and an odd secant is a line incident with an odd number of points of the set...

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Combinatorics