Mathematics – Number Theory
Scientific paper
2009-10-08
Mathematics
Number Theory
20 pages, conference talk given in 2006 at HRI, Allahabad, India and published in Number Theory and Applications, Proceedings
Scientific paper
In the context of cyclotomic fields, it is still unknown whether there exist Euler systems other than the ones derived from cyclotomic units. Nevertheless, we first give an exposition on how norm-compatible units are generated by any Euler system, following work of Coates. Then we prove that the units obtained from Euler systems and the cyclotomic units generate the same $\mathbb{Z}_{p}$-module for any odd prime $p$. The techniques adopted for the Iwasawa theoretic proof in latter part of this article originated in Rubin's work on main conjectures of Iwasawa theory.
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