Dougherty, Steven T.Sąhinkaya, Serap2025-03-172025-03-172023978-147046859-00271-4132https://doi.org/10.1090/conm/785/15777https://hdl.handle.net/20.500.13099/1377Virtual Conference in Honor of Tariq Rizvi Noncommutative Rings and their Application VII, NCRA 2021, and Virtual Conference on Quadratic forms, rings and codes, QFRC 2021 -- 8 July 2021 through 8 July 2021 -- Virtual, Online -- 295109We relate quasi-self-dual codes over a non-unital ring to additive self-dual codes over the additive group of the ring. We show that the Hamming weight enumerator of a quasi-self-dual code over this non-unital ring must belong to the same ring of invariants that self-dual codes over the Frobenius rings with unities belong. Additionally, the Hamming weight enumerator of a Type IV code over E must reside in the same ring of invariants as a Type IV code over the field of order 4. © 2023 American Mathematical Society.eninfo:eu-repo/semantics/closedAccessCodegrouporthogonalityringConference Object10.1090/conm/785/1577778579882-s2.0-85163075863Q3