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Extra resources for Algebraic Geometry and Its Applications: Dedicated to Gilles Lachaud on His 60th Birthday (Series on Number Theory and Its Applications)
However, the method given in  lacks an efficient procedure for testing whether a given α ∈ B is an endomorphism of J. 1) for determining whether an element of the set is an endomorphism of J. 8. We begin by observing that since K = Q(π), any α ∈ OK can be expressed as a polynomial f ∈ Q[π]. Since π satisfies a polynomial of degree 4 (the characteristic polynomial of Frobenius), f can be taken to have degree 3. We may thus write α= a0 + a1 π + a2 π 2 + a3 π 3 n (2) for some integers a0 , a1 , a2 , a3 , n.
Since α1σ and α2 both generate (α2 ) and √ have absolute value p, we deduce that α1σ = ±α2 . Step 4c ensures that this sign is positive, so α1 and α2 have the same characteristic polynomial hi (x), and thus the Frobenius element could be any of the elements output by Step 6. Since Aut(K/Q) is generated by σ and σ 2 is complex conjugation, we have output the Aut(K/Q)-orbit of the Frobenius element. If K is not Galois, then the Frobenius element must be either αi or αi . Since Aut(K/Q) in this case consists of only the identity and complex conjugation, Step 6 outputs the Aut(K/Q)-orbit of the Frobenius element.
Proof. The set B¯ is a Z/nZ-basis of OK /nOK , so if π k ≡ (1, 0, 0, 0) (mod n), then π k −1 ∈ nOK (since the first element of B¯ is 1). Since nOK is mapped to itself by Aut(K/Q), we have (π σ )k −1 ∈ nOK .