In this paper, we study the Iwasawa $$\lambda $$ -invariant of the cyclotomic $$\mathbb Z _2$$ -extension of a real quadratic field $$\mathbb Q (\sqrt{p_1p_2p_3p_4})$$ , where $$p_1, p_2, p_3$$ and $$
In this paper, we study the Iwasawa λ -invariant of the cyclotomic Z ₂ -extension of a real quadratic field Q (√p₁p₂p₃p₄) , where p₁, p₂, p₃ and p₄ are distinct odd prime numbers satisfying certain arithmetic conditions. We give a new infinite family of real quadratic fields for which Greenberg’s conjecture holds.
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Mizusawa et al. (2026) studied this question.
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