Pointless curves of genus three and four
Abstract
A curve over a field k is pointless if it has no k-rational points. We show that there exist pointless genus-3 hyperelliptic curves over a finite field Fq if and only if q < 26, that there exist pointless smooth plane quartics over Fq if and only if either q < 24 or q = 29 or q = 32, and that there exist pointless genus-4 curves over Fq if and only if q < 50.
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