کریم سامعی

For any odd prime p such that pm  1 (mod 4) , the structures of all –constacyclic codes of length 4ps over the finite commutive chain ring Fpm + uFpm(u2 = 0) are established in terms of their generator polynomials , if the unit  is square , each  –constacyclic code of length 4ps is expressed as a direct sum of an 􀀀 - constacyclic code and an - constacyclic code of length 2ps.