For a real biquadratic field, we denote by λ\documentclass[12pt]{minimal}
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\begin{document}$$\lambda$$\end{document}, μ\documentclass[12pt]{minimal}
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\begin{document}$$\mu$$\end{document} and ν\documentclass[12pt]{minimal}
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\begin{document}$$\nu$$\end{document} the Iwasawa
invariants of cyclotomic Z2\documentclass[12pt]{minimal}
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\begin{document}$$\mathbb{Z}_{2}$$\end{document}-extension of k\documentclass[12pt]{minimal}
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\begin{document}$$k$$\end{document}. We give certain families of real
biquadratic fields k\documentclass[12pt]{minimal}
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\begin{document}$$k$$\end{document} such that μ=0\documentclass[12pt]{minimal}
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\begin{document}$$\mu=0$$\end{document}.