Abstract. Let $f(x)\in \mathbb Z [x]$ be monic and irreducible over $\mathbb Q $, with $\deg (f)=n$. Let $K=\mathbb Q (\theta )$, where $f(\theta )=0$, and let $\mathbb Z _K$ denote the ring of integers of $K$. We say $f(x)$ is \emph{non-monogenic} if $ \{1,\theta ,\theta^2,\ldots , \theta ^{n-1} \}$ is not a basis for $\mathbb Z_K$. By extending ideas of Ratliff, Rush and Shah, we construct infinite families of non-monogenic trinomials.

DOI: 10.14232/actasm-021-463-3

AMS Subject Classification (1991): 11R04; 11R09, 12F05

Keyword(s): monogenic, trinomial, irreducible

received 13.2.2021, accepted 2.3.2021. (Registered under 213/2021.)