Designs and their codes
A bound on the number of points of a plane curve
Finite Fields and Their Applications
Toward determination of optimal plane curves with a fixed degree over a finite field
Finite Fields and Their Applications
Sziklai's conjecture on the number of points of a plane curve over a finite field III
Finite Fields and Their Applications
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This paper has double purposes. One of them is to give a new bound on the number of points of a plane curve of degree d over a finite field that meets Sziklai's conjectural bound at d=q+1. An example shows that this bound is sharp for d=q+1. The second one is to study an example against that conjecture for q=d=4. This curve also shows the sharpness of our bound.