Characterizing the entropy function region via extreme rays

Abstract

Contrary to the traditional method of information inequalities, in this paper, the entropy function region Γ_n* and its closure ̅Γ_n* are characterized via extreme rays of its outer bound polymatroidal region Γ_n. The characterization of Γ₃* and the tightness of Γ_n as an outer bound on ̅Γ_n* are studied.