Introduction to Matroids
Bancerek, Grzegorz, Shidama, Yasunari
Convex Sets and Convex Combinations on Complex Linear Spaces
Matsuzaki, Hidenori, Endou, Noboru, Shidama, Yasunari
Definition of Flat Poset and Existence Theorems for Recursive Call
Ishida, Kazuhisa, Shidama, Yasunari, Grabowski, Adam