| 1 | -- | 14 | Marco Riccardi. Categorical Pullbacks |
| 15 | -- | 27 | Kazuhisa Nakasho, Hiroshi Yamazaki, Hiroyuki Okazaki, Yasunari Shidama. Definition and Properties of Direct Sum Decomposition of Groups1 |
| 29 | -- | 49 | Yuichi Futa, Hiroyuki Okazaki, Yasunari Shidama. Matrix of ℤ-module1 |
| 51 | -- | 57 | Noboru Endou, Kazuhisa Nakasho, Yasunari Shidama. σ-ring and σ-algebra of Sets1 |
| 59 | -- | 65 | Kazuhisa Nakasho, Noboru Endou. Separability of Real Normed Spaces and Its Basic Properties |
| 67 | -- | 73 | Kazuhisa Nakasho, Hiroyuki Okazaki, Hiroshi Yamazaki, Yasunari Shidama. Equivalent Expressions of Direct Sum Decomposition of Groups1 |