Not to be confused with group presentation. Representation theory is a branch of mathematics that studies abstract algebraic structures by representing their elements as linear transformations of vector spaces, and studies modules over these abstract algebraic structures.
The signature effect of HIV infection, and the cause of AIDS, is disruption of the T-lymphocyte branch of the immune system and in particular the destruction of CD4+ T-helper cells.
HIV affects specific cells of the immune system, called CD4 cells, or T cells. Over time, if left untreated, HIV can destroy so many of these cells that the body canât fight off infections and disease.IDS is the stage of infection that occurs when your immune system is badly damaged and you become vulnerable to. . When the number of your CD4 cells falls below 200 cells per cubic millimeter of blood (200 cells/mm3), you are considered to have progressed to AIDS.