I’m trying to work on Coleman’s conjecture for abelian extensions of imaginary quadratic fields. I’ve read most papers by Seo regarding circular distributions. However, I’m a still confused about what it means that “all Euler systems come from cyclotomic units in an easy way”; what does this mean and what is that easy way?
Also, what is the extend to which similar thing can be done if the field Q of rationals is replaced by an imaginary quadratic field?