Journal of Classical Analysis · Volume 15, Issue 1 Fundamental theorems of summability theory for a new type of subsequences of double sequences 15-03 Pages 23-33 DOI 10.7153/jca-2019-15-03 Downloads Short PDF Full PDF PNG Authors Raluca Dumitru Jose A. Franco Keywords subsequences of a double sequence β-sections convergence divergence limit points Pringsheim Subject classes 40B05 40A05