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When [Formula: see text] is not a unit in [Formula: see text], we consider several subcases and determine the algebraic structures of constacyclic codes in those cases. Further, we also provide the number of codewords and the duals of [Formula: see text]-constacyclic codes. <\/jats:p>","DOI":"10.1142\/s179383092550065x","type":"journal-article","created":{"date-parts":[[2025,3,26]],"date-time":"2025-03-26T04:53:09Z","timestamp":1742964789000},"source":"Crossref","is-referenced-by-count":0,"title":["Repeated-root constacyclic codes of length 3ps over the finite non-chain ring  \ud835\udd3dpm[u,v] \u3008u2,v2,uv\u2212vu\u3009 and their duals"],"prefix":"10.1142","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-2434-6778","authenticated-orcid":false,"given":"Divya","family":"Acharya","sequence":"first","affiliation":[{"name":"Department of Mathematics, Manipal Institute of Technology Bengaluru, Manipal Academy of Higher Education, Manipal 576104, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0749-8994","authenticated-orcid":false,"given":"Prasanna","family":"Poojary","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Manipal Institute of Technology Bengaluru, Manipal Academy of Higher Education, Manipal 576104, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0631-0205","authenticated-orcid":false,"given":"G. 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