On monogenity of certain pure number fields defined by x2u⋅3v⋅5t−mx^{2^u\cdot 3^v\cdot 5^t}-m

preprint2022arXivOpen access

Abstract

Let K=Q(α)K = \mathbb{Q} (α) be a pure number field generated by a root αα of a monic irreducible polynomial F(x)=x2u⋅3v⋅5t−m F(x) = x^{2^u\cdot 3^v\cdot 5^t}-m, with m≠±1 m \neq \pm 1 a square free rational integer, uu, vv and tt three positive integers. In this paper, we study the monogenity of KK. We prove that if $m\not\equiv 1\md4$, $m\not\equiv \pm 1\md9$, and $m\not\in\{\pm 1, \pm 7\}\md{25}$, then KK is monogenic. But if {$m\equiv 1\md{4}$} or $m\equiv 1\md9$ or $m\equiv -1\md9$ and u=2ku=2k for some odd integer kk or u≥2u\ge 2 and $m\equiv 1\md{25}$ or $m\equiv -1\md{25}$ and u=2ku=2k for some odd integer kk or u=v=1u=v=1 and $m\equiv \pm 82\md{5^4}$, then KK is not monogenic.

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