Repeated-root constacyclic codes of length slmpn

For any different odd primes l and p, structure of constacyclic codes of length 2l m p n over a finite field Fq of characteritic p and their duals is established in term of their generator polynomials. Among other results, all linear complimentary dual and self-dual constacyclic codes of length 2l m p n over Fq are obtained.

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