A Study on Subdirect Irreducibility of the Subgroup Lattice of the Group of 2×2 Matrices over Zp A. Vethamanickam C. Krishna Kumar Abstract In this paper we determine subdirectly irreducibility of the subgroup lattice of the group of 2 2 matrices over Zp when p = 3, 5 and 7. PDF Published 2019-10-16 Issue Vol. 21 No. 5 (2019) Section Articles