Abstract
In this paper, we study λ-constacyclic codes over the ring R = Z 3 [u, v]/ for λ = (1 + u),(2 + 2u) and 2. We introduce a Gray map from R to Z 3 3 and show that the Gray image of a cyclic code is a quasi-cyclic code of index 3. It is proved that the Gray image of λ-constacyclic code over R is permutation equivalent to either quasi-cyclic or quasi-twisted code according to the value of λ. Moreover, we determine the structure of (1+u)-constacyclic codes for an odd length n over R and give some suitable examples.
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