Introduction to Matroids
Bancerek, Grzegorz, Shidama, Yasunari
Torsion Z-module and Torsion-free Z-module
Futa, Yuichi, Okazaki, Hiroyuki, Nakasho, Kazuhisa, Shidama, Yasunari
Riemann Integral of Functions R into C
Miyajima, Keiichi, Kato, Takahiro, Shidama, Yasunari