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 Ideals of ${\mathbb Z}_{p^n}[X]/({X^l}-1)$ Commun. Korean Math. Soc. 2011 Vol. 26, No. 3, 427-443 https://doi.org/10.4134/CKMS.2011.26.3.427Published online September 1, 2011 Sung Sik Woo Ewha Women's University Abstract : In [6, 8], we showed that any ideal of $\mathbb{Z}_4[X]/(X^{l}-1)$ is generated by at most two polynomials of the standard' forms when $l$ is even. The purpose of this paper is to find the standard' generators of the cyclic codes over $\mathbb{Z}_{p^a}$ of length a multiple of $p$, namely the ideals of $\mathbb{Z}_{p^a}[X]/(X^l-1)$ with an integer $l$ which is a multiple of $p$. We also find an explicit description of their duals in terms of the generators when $a=2$. Keywords : cyclic code over $\mathbb{Z}_{p^a}$, ideals of $\mathbb{Z}_{p^n}[X]/(X^l-1)$ MSC numbers : 13M05, 11T71 Downloads: Full-text PDF