Read e-book online Algorithms For Modular Elliptic Curves PDF

By J. E. Cremona

ISBN-10: 0521598206

ISBN-13: 9780521598200

Elliptic curves are of significant and growing to be significance in computational quantity idea, with a variety of purposes in such parts as cryptography, primality checking out and factorisation. This e-book, now in its moment version, offers an intensive remedy of many algorithms in regards to the mathematics of elliptic curves, with comments on machine implementation. it truly is in 3 elements. First, the writer describes intimately the development of modular elliptic curves, giving an specific set of rules for his or her computation utilizing modular symbols. Secondly a set of algorithms for the mathematics of elliptic curves is gifted; a few of these haven't seemed in booklet shape ahead of. They contain: discovering torsion and non-torsion issues, computing heights, discovering isogenies and classes, and computing the rank. ultimately, an intensive set of tables is equipped giving the result of the author's implementation of the algorithms. those tables expand the commonly used 'Antwerp IV tables' in methods: the variety of conductors (up to 1000), and the extent of element given for every curve. specifically, the amounts in terms of the Birch Swinnerton-Dyer conjecture were computed in every one case and are incorporated. All researchers and graduate scholars of quantity concept will locate this booklet worthy, relatively these drawn to the computational aspect of the topic. That point will make it charm additionally to laptop scientists and coding theorists.

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N=1 Suppose, as above, that f |WN = εN f . Then f ⊗ χ is in S2 (N l2 ), and (f ⊗ χ) |WN l2 = χ(−N )εN f ⊗ χ (special case of equation (14) in [64]). 1 to obtain the following. 2. Let f be as above. Let l be an odd prime not dividing N . If χ(−N ) = ε N then L(f ⊗ χ, 1) = 0, while if χ(−N ) = −εN , then √ χ(n)a(n, f ) exp(−2πn/l N ). 10). Let √ g(χ) be the Gauss sum attached to χ: if l ≡ 1 (mod 4) then χ(−1) = +1 and g(χ) = l, while √ if l ≡ 3 (mod√4) then χ(−1) = −1 and g(χ) = i l. If we set l∗ = χ(−1)l then in all cases we have g(χ) = l∗ .

It is slightly simpler to use a modular symbol of the form {0, α} here instead of {α, ∞}, since (for suitable α) this will be integral. 1) has more terms of the form {0, β} on the right, so this is slower in practice. Remark. 1) and the remarks following it show that the modular symbol {α, ∞} lies in the rational homology H1 (X0 (N ), Q) provided that the denominator of α is coprime to N . 3) for Γ0 (N ). Implementation. In practice we only use the first method if L(f, 1) = 0 for all the rational newforms f in S2 (N ).

In order to compute the degree of the map ϕ: X → Ef , the idea used in [69] is to compute the Petersson norm ||f || in two ways. The first way involves deg(ϕ) explicitly, while the second expresses it as a sum of terms involving periods, which can be evaluated as above. 1. Let f (z) be a cusp form of weight 2 for G as above, and ϕ: X → E f the associated modular parametrization. Then 4π 2 ||f ||2 = deg(ϕ)Vol(Ef ). Remark. In terms of the fundamental periods ω1 , ω2 of Ef , the volume is given by Vol(Ef ) = |Im (ω1 ω2 )|.

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Algorithms For Modular Elliptic Curves by J. E. Cremona

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