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On the Iwasawa $\mu $-invariants of supersingular elliptic curves

Volume 194 / 2020

Anupam Saikia Acta Arithmetica 194 (2020), 179-186 MSC: Primary 11R23; Secondary 11G05. DOI: 10.4064/aa190213-28-8 Published online: 2 March 2020


We explore the relation between the Iwasawa invariants $\mu ^{+}$ and $\mu ^{-}$ associated respectively with the plus and the minus Selmer groups of two elliptic curves $E_{1}$ and $E_{2}$ over $\mathbb {Q}$ having isomorphic Galois representations $E_{1}[p^{r}]\cong E_{2}[p^{r}]$ at a prime $p$ of supersingular reduction. We prove that $\mu ^{\pm }(E_{1})=\mu ^{\pm }(E_{2})$ if either is less than $r$, and $\mu ^{\pm }(E_{1}), \mu ^{\pm }(E_{2})\geq r $ if either is greater than or equal to $r$.


  • Anupam SaikiaDepartment of Mathematics
    Indian Institute of Technology Guwahati
    Guwahati 781039, Assam, India

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