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arXiv · 2610.42137

On the Iwasawa invariants of admissible quadratic twists of elliptic curves at ordinary Eisenstein primes

Mulun Yin
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Abstract

We study the Iwasawa $μ$- and $λ$-invariants of quadratic twists of rational elliptic curves at Eisenstein primes $p\geq 3$. We verify Greenberg's $μ=0$ conjecture for all such twists, which gives an Euler system free proof of Mazur's cotorsion conjecture, and study the $λ$-invariants when the twist is admissible in the sense of [GV00]. As a consequence, we prove the cyclotomic Iwasawa Main Conjecture and obtain the $p$-part BSD formulae in rank $0$ for admissible twists under mild conditions, covering many elliptic curves of potentially ordinary reduction.

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Mulun Yin. 2026-10-30. On the Iwasawa invariants of admissible quadratic twists of elliptic curves at ordinary Eisenstein primes. https://arxiv.org/abs/2610.42137

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