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A Family of Cyclic Quartic Fields Arising from Modular Curves

A Family of Cyclic Quartic Fields Arising from Modular Curves

We study a family of cyclic quartic fields arising from the covering of modular curves ${X_1}(16) \to {X_0}(16)$. An integral basis and a fundamental system of units are found. It is shown that a root of the quartic polynomial we construct is a translate of a cyclotomic period by an …