Abebew, Tilahun (PhD)Argachew, Tewodros2020-12-142023-11-042020-12-142023-11-042014-08-08http://etd.aau.edu.et/handle/123456789/24010This paper is concerned on the basic properties of weyl algebra, and length of 􀜦- modules over the weyl algebra. I have only tied to present the length of A3 –modules and its composition series by considering polynomial rings with three variables.enLengthD-ModuleThesis