Abstract
We show that for all odd primes p, there exist ordinary elliptic curves over F ¯ p ( x ) with arbitrarily high rank and constant j-invariant. This shows in particular that there are elliptic curves with arbitrarily high rank over these fields for which the corresponding elliptic surface is not supersingular. The result follows from a theorem which states that for all odd prime numbers p and ℓ, there exists a hyperelliptic curve over F ¯ p of genus ( ℓ − 1 ) / 2 whose Jacobian is isogenous to the power of one ordinary elliptic curve.
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