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.
Many people with HIV also have problems with their levels of white blood cells (leukocytes). Leukocytes are white blood cells that respond to and protect the body from infection. HIV can attack leukocytes.When the number of white blood cells decreases, a dangerous condition called leukopenia can develop, which makes the body more prone to infections. The specific type of white blood cells that respond directly to infection are called neutrophils.any people with HIV also have problems with their levels of white blood cells (leukocytes). Leukocytes are white blood cells that respond to and protect the body from infection. HIV can attack leukocytes.