We produce an absolute lower bound for the height of the algebraic numbers (different from zero and from the roots of unity) lying in an abelian extension of the rationals. The proof rests on elementary congruences in cyclotomic fields and on Kronecker Weber theorem.
A lower bound for the canonical height on elliptic curves over abelian extensions
β Scribed by Joseph H. Silverman
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 296 KB
- Volume
- 104
- Category
- Article
- ISSN
- 0022-314X
No coin nor oath required. For personal study only.
β¦ Synopsis
Let E=K be an elliptic curve defined over a number field, let Δ₯ be the canonical height on E; and let K ab =K be the maximal abelian extension of K: Extending work of M. Baker (IMRN 29 (2003) 1571-1582), we prove that there is a constant CΓ°E=KΓ40 so that every nontorsion point PAEΓ°K ab Γ satisfies Δ₯Γ°PΓ4CΓ°E=KΓ:
π SIMILAR VOLUMES
The elliptical stadium is a plane region bounded by a curve constructed by joining two half-ellipses, with half axes a > 1 and b = 1, by two parallel segments of equal length 2h. proved that if I < a < ~ and ifh is large enough then the corresponding billiard map has non-vanishing Lyapunov exponents