Polygonal Numbers
Grabowski, Adam
Stone Lattices
Grabowski, Adam
Elementary Number Theory Problems. Part XVIII
Grabowski, Adam
Tarski Geometry Axioms. Part V – Half-planes and Planes
Coghetto, Roland, Grabowski, Adam
Topological Interpretation of Rough Sets
Grabowski, Adam
Definition of Flat Poset and Existence Theorems for Recursive Call
Ishida, Kazuhisa, Shidama, Yasunari, Grabowski, Adam