Abstract
Let R be an arbitrary commutative finite chain ring, γ a generator of the maximal ideal and R× the multiplicative group of units of R. For any w∈R×, the structural properties and dual codes of (1+wγ)-constacyclic codes of arbitrary length over R are given. As corollaries, self-dual constacyclic codes over the finite chain ring F2m+uF2m (u2=0) and the Galois ring GR(2s,m) are provided.
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