Analysis computes 3-class groups A_n in cyclotomic Z_3-extensions, confirming Greenberg's conjecture.
We compute the 3-class groups A_n of the fields F_n in the cyclotomic Z_3-extensions of the real quadratic fields of discriminant f < 100,000. In all cases the orders of A_n remain bounded as n goes to infinity. This is in agreement with Greenberg's conjecture.
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Mercuri et al. (2025) studied this question.
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