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We revisit the theory of Ihara $L$-functions in the context initially studied by Bass and Hashimoto and more recently by Zakharov. In particular, we study if the Artin formalism is satisfied by these $L$-functions. As an application, we…

Number Theory · Mathematics 2025-08-12 Rusiru Gambheera , Daniel Vallières

We study a natural question in the Iwasawa theory of algebraic curves of genus $>1$. Fix a prime number $p$. Let $X$ be a smooth, projective, geometrically irreducible curve defined over a number field $K$ of genus $g>1$, such that the…

Number Theory · Mathematics 2023-02-28 Anwesh Ray

In these notes, we explore possible stable properties for the zeta function of a geometric Zp-tower of curves over a finite field of characteristic p, in the spirit of Iwasawa theory. A number of fundamental questions and conjectures are…

Number Theory · Mathematics 2019-12-04 Daqing Wan

We consider finite graphs whose vertexes are supersingular elliptic curves, possibly with level structure, and edges are isogenies. They can be applied to the study of modular forms and to isogeny based cryptography. The main result of this…

Number Theory · Mathematics 2026-04-13 Giulio Codogni , Guido Maria Lido

We investigate a novel geometric Iwasawa theory for $\mathbf{Z}_p$-extensions of function fields over a perfect field $k$ of characteristic $p>0$ by replacing the usual study of $p$-torsion in class groups with the study of $p$-torsion…

Number Theory · Mathematics 2022-10-03 Jeremy Booher , Bryden Cais

We present certain results on the Iwasawa theory of an abelian variety with potentially good ordinary reduction at all primes above $p$. These are then applied to study Diophantine stability and integally Diophantine extensions. Along the…

Number Theory · Mathematics 2026-04-08 Meng Fai Lim

In the first part of the paper, we fix a non-CM elliptic curve $E/\mathbb{Q}$ and an odd prime $\ell$ and investigate the distribution of invariants associated to the $\ell$-volcano containing the reduction $E_p$, as $p$ ranges over primes…

Number Theory · Mathematics 2025-12-22 Anwesh Ray

The main conjectures of Iwasawa theory provide the only general method known at present for studying the mysterious relationship between purely arithmetic problems and the special values of complex L-functions, typified by the conjecture of…

Number Theory · Mathematics 2010-06-29 J. Coates , T. Fukaya , K. Kato , R. Sujatha , O. Venjakob

We extend Kobayashi's formulation of Iwasawa theory for elliptic curves at supersingular primes to include the case $a_p \neq 0$, where $a_p$ is the trace of Frobenius. To do this, we algebraically construct $p$-adic $L$-functions…

Number Theory · Mathematics 2011-06-10 Florian "Ian" Sprung

This is the first in a series of articles where we will study the Iwasawa theory of an elliptic modular form f along the anticyclotomic Zp-tower of an imaginary quadratic field K where the prime p splits completely. Our goal in this portion…

Number Theory · Mathematics 2017-07-04 Kazim Büyükboduk , Antonio Lei

Isogenies, the mappings of elliptic curves, have become a useful tool in cryptology. These mathematical objects have been proposed for use in computing pairings, constructing hash functions and random number generators, and analyzing the…

Cryptography and Security · Computer Science 2009-10-29 Daniel Shumow

We consider the structures formed by isogenies of abelian varieties with polarizations that are not necessarily principal, specifically with the $[\ell]$-polarizations we have previously defined. Our primary interest is in superspecial…

Number Theory · Mathematics 2022-05-17 Bruce W. Jordan , Yevgeny Zaytman

The Jacobian is an algebraic invariant of a graph which is often seen in analogy to the class group of a number field. In particular, there have been multiple investigations into the Iwasawa theory of graphs with the Jacobian playing the…

Number Theory · Mathematics 2024-07-10 Jon Aycock

We obtain explicit formulas for the number of non-isomorphic elliptic curves with a given group structure (considered as an abstract abelian group). Moreover, we give explicit formulas for the number of distinct group structures of all…

Number Theory · Mathematics 2010-03-16 Reza Rezaeian Farashahi , Igor E. Shparlinski

In this note, we consider an l-isogeny descent on a pair of elliptic curves over Q. We assume that l > 3 is a prime. The main result expresses the relevant Selmer groups as kernels of simple explicit maps between finite- dimensional…

Number Theory · Mathematics 2011-12-22 R. L. Miller , M. Stoll

Let $\mathcal{E}$ be a $\mathbb{Q}$-isogeny class of elliptic curves defined over $\mathbb{Q}$. The isogeny graph associated to $\mathcal{E}$ is a graph which has a vertex for each elliptic curve in the $\mathbb{Q}$-isogeny class…

Number Theory · Mathematics 2021-01-27 Garen Chiloyan , Álvaro Lozano-Robledo

In this paper, we make a study of the Iwasawa theory of an elliptic curve at a supersingular prime p along an arbitrary Z_p-extension of a number field K in the case when p splits completely in K. Generalizing work of Kobayashi and…

Number Theory · Mathematics 2007-05-23 Adrian Iovita , Robert Pollack

Given an integer $D$ and an ordinary isogeny class of abelian varieties defined over a finite field $\mathbb{F}_q$ with commutative $\mathbb{F}_q$-endomorphism algebra, we provide algorithms for computing all isogenies of degree dividing…

Number Theory · Mathematics 2026-01-30 Edgar Costa , Taylor Dupuy , Stefano Marseglia , David Roe , Christelle Vincent

Fix an ordinary abelian variety defined over a finite field. The ideal class group of its endomorphism ring acts freely on the set of isogenous varieties with same endomorphism ring, by complex multiplication. Any subgroup of the class…

Number Theory · Mathematics 2017-01-26 Dimitar Jetchev , Benjamin Wesolowski

An isogeny graph is a graph whose vertices are principally polarized abelian varieties and whose edges are isogenies between these varieties. In his thesis, Kohel described the structure of isogeny graphs for elliptic curves and showed that…

Number Theory · Mathematics 2019-02-20 Sorina Ionica , Emmanuel Thomé