English

Sequences associated to elliptic curves

Number Theory 2019-09-30 v1

Abstract

Let EE be an elliptic curve defined over a field KK (with char(K)2char(K)\neq 2) given by a Weierstrass equation and let P=(x,y)E(K)P=(x,y)\in E(K) be a point. Then for each nn 1\geq 1 and some γK\gamma \in K^{\ast } we can write the xx- and yy-coordinates of the point [n]P[n]P as \begin{equation*} \lbrack n]P=\left( \frac{\phi_n(P)}{\psi_n^2(P)}, \frac{\omega_n(P) }{\psi_n^3(P)} \right) =\left( \frac{\gamma^2 G_n(P)}{F_n^2(P)}, \frac{\gamma^3 H_n(P)}{F_n^3(P)}\right) \end{equation*} where ϕn,ψn,ωnK[x,y]\phi_n,\psi_n,\omega_n \in K[x,y], gcd(ϕn,ψn2)=1\gcd (\phi_n,\psi_n^2)=1 and \begin{equation*} F_n(P) = \gamma^{1-n^2}\psi_n(P), G_n(P) = \gamma ^{-2n^{2}}\phi_{n}(P),H_{n}(P) = \gamma ^{-3n^{2}} \omega_n(P) \end{equation*} are suitably normalized division polynomials of EE. In this work we show the coefficients of the elliptic curve EE can be defined in terms of the sequences of values (Gn(P))n0(G_{n}(P))_{n\geq 0} and (Hn(P))n0(H_{n}(P))_{n\geq 0} of the suitably normalized division polynomials of EE evaluated at a point PE(K)P \in E(K). Then we give the general terms of the sequences (Gn(P))n0(G_{n}(P))_{n\geq 0} and (Hn(P))n0(H_{n}(P))_{n\geq 0} associated to Tate normal form of an elliptic curve. As an application of this we determine square and cube terms in these sequences.

Keywords

Cite

@article{arxiv.1909.12654,
  title  = {Sequences associated to elliptic curves},
  author = {Betül Gezer},
  journal= {arXiv preprint arXiv:1909.12654},
  year   = {2019}
}
R2 v1 2026-06-23T11:28:06.156Z