Some examples of 5 and 7 descent for elliptic curves over $Q$

Tom Fisher

Displaying similar documents to “Some examples of 5 and 7 descent for elliptic curves over $Q$ ”

On the average value of the canonical height in higher dimensional families of elliptic curves

Wei Pin Wong (2014)

Acta Arithmetica

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Given an elliptic curve E over a function field K = ℚ(T₁,...,Tₙ), we study the behavior of the canonical height $h ̂_{E_{ω}}$ of the specialized elliptic curve $E_{ω}$ with respect to the height of ω ∈ ℚⁿ. We prove that there exists a uniform nonzero lower bound for the average of the quotient $(h ̂_{E_{ω}} (P_{ω})) / h (ω)$ over all nontorsion P ∈ E(K).

On invariants of elliptic curves on average

Amir Akbary, Adam Tyler Felix (2015)

Acta Arithmetica

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We prove several results regarding some invariants of elliptic curves on average over the family of all elliptic curves inside a box of sides A and B. As an example, let E be an elliptic curve defined over ℚ and p be a prime of good reduction for E. Let $e_{E} (p)$ be the exponent of the group of rational points of the reduction modulo p of E over the finite field $_{p}$ . Let be the family of elliptic curves $E_{a, b} : y^{2} = x^{3} + a x + b$ , where |a| ≤ A and |b| ≤ B. We prove that, for any c > 1 and k∈ ℕ, $1 / | | \sum_{E \in} \sum_{p \leq x} e_{E}^{k} (p) = C_{k} l i (x^{k + 1}) + O ((x^{k + 1}) / {(l o g x)}^{c}$ )as x → ∞, as long...

Infinite rank of elliptic curves over $ℚ^{a b}$

Bo-Hae Im, Michael Larsen (2013)

Acta Arithmetica

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If E is an elliptic curve defined over a quadratic field K, and the j-invariant of E is not 0 or 1728, then $E (ℚ^{a b})$ has infinite rank. If E is an elliptic curve in Legendre form, y² = x(x-1)(x-λ), where ℚ(λ) is a cubic field, then $E (K ℚ^{a b})$ has infinite rank. If λ ∈ K has a minimal polynomial P(x) of degree 4 and v² = P(u) is an elliptic curve of positive rank over ℚ, we prove that y² = x(x-1)(x-λ) has infinite rank over $K ℚ^{a b}$ .

Elliptic curves with $ℚ (ℰ [3]) = ℚ (ζ_{3})$ and counterexamples to local-global divisibility by 9

Laura Paladino (2010)

Journal de Théorie des Nombres de Bordeaux

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We give a family $ℱ_{h, β}$ of elliptic curves, depending on two nonzero rational parameters $β$ and $h$ , such that the following statement holds: let $ℰ$ be an elliptic curve and let $ℰ [3]$ be its 3-torsion subgroup. This group verifies $ℚ (ℰ [3]) = ℚ (ζ_{3})$ if and only if $ℰ$ belongs to $ℱ_{h, β}$ . Furthermore, we consider the problem of the local-global divisibility by 9 for points of elliptic curves. The number 9 is one of the few exceptional powers of primes, for which an answer...

The torsion subgroup of a family of elliptic curves over the maximal abelian extension of $ℚ$

Jerome Tomagan Dimabayao (2020)

Czechoslovak Mathematical Journal

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We determine explicitly the structure of the torsion group over the maximal abelian extension of $ℚ$ and over the maximal $p$ -cyclotomic extensions of $ℚ$ for the family of rational elliptic curves given by $y^{2} = x^{3} + B$ , where $B$ is an integer.

Small discriminants of complex multiplication fields of elliptic curves over finite fields

Igor E. Shparlinski (2015)

Czechoslovak Mathematical Journal

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We obtain a conditional, under the Generalized Riemann Hypothesis, lower bound on the number of distinct elliptic curves $E$ over a prime finite field $𝔽_{p}$ of $p$ elements, such that the discriminant $D (E)$ of the quadratic number field containing the endomorphism ring of $E$ over $𝔽_{p}$ is small. For almost all primes we also obtain a similar unconditional bound. These lower bounds complement an upper bound of F. Luca and I. E. Shparlinski (2007).

A local-global principle for rational isogenies of prime degree

Andrew V. Sutherland (2012)

Journal de Théorie des Nombres de Bordeaux

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Let $K$ be a number field. We consider a local-global principle for elliptic curves $E / K$ that admit (or do not admit) a rational isogeny of prime degree $ℓ$ . For suitable $K$ (including $K = ℚ$ ), we prove that this principle holds for all $ℓ \equiv 1 mod 4$ , and for $ℓ < 7$ , but find a counterexample when $ℓ = 7$ for an elliptic curve with $j$ -invariant $2268945 / 128$ . For $K = ℚ$ we show that, up to isomorphism, this is the only counterexample.

The Mordell-Weil bases for the elliptic curve $y^{2} = x^{3} - m^{2} x + m^{2}$

Sudhansu Sekhar Rout, Abhishek Juyal (2021)

Czechoslovak Mathematical Journal

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Let $D_{m}$ be an elliptic curve over $ℚ$ of the form $y^{2} = x^{3} - m^{2} x + m^{2}$ , where $m$ is an integer. In this paper we prove that the two points $P_{- 1} = (- m, m)$ and $P_{0} = (0, m)$ on $D_{m}$ can be extended to a basis for $D_{m} (ℚ)$ under certain conditions described explicitly.

Displaying similar documents to “Some examples of 5 and 7 descent for elliptic curves over Q ”

Displaying similar documents to “Some examples of 5 and 7 descent for elliptic curves over $Q$ ”