Preface
Grabowski, Adam, Shidama, Yasunari
On the Permanent of a Matrix
Romanowicz, Ewa, Grabowski, Adam
On Two Alternative Axiomatizations of Lattices by McKenzie and Sholander
Grabowski, Adam, Sawicki, Damian
Topological Interpretation of Rough Sets
Grabowski, Adam
Polygonal Numbers
Grabowski, Adam
On Square-Free Numbers
Grabowski, Adam