Kragujevac Journal of Mathematics, cilt.40, sa.1, ss.35-45, 2016 (Scopus)
In the present paper, we give the definitions of four dimensional conull and coregular matrices, and characterize the classes (Mu: Cv), where v ε (p, p0; f) and Cf denotes the space of all almost convergent double sequences. Additionally, we give two Steinhaus type theorems related to the coercive/almost coercive four dimensional sequence to sequence matrix transformations.