Moussavi, Ahmed2024-07-122024-07-122009Moussavi, A. (2009). Skew power series extensions of principally projective rings. International Conference on Mathematical Sciences, Maltepe Üniversitesi. s. 51-52.9.78605E+12https://hdl.handle.net/20.500.12415/2955Let R be a ring and ? be a weakly rigid automorphism of R. If R is Armendariz of skew-powerseries type, then R[[x; ?]] is right principally projective if and only if R is right principally projective and any countable set of right semicentral idempotents of R has a generalized join. As a consequence, we obtain a generalization of Fraser and Nicholson’s result in the class of reduced p.p.-rings [5, Theorem 3].enCC0 1.0 Universalinfo:eu-repo/semantics/openAccessBaer ringrght p.p.-ringa-compatible ringArmendariz ringskew power series ringConference Object5251