| 摘要 | 第3-4页 |
| ABSTRACT(英文摘要) | 第4页 |
| 前言 | 第6-8页 |
| 1 Some examples of quasi-lattice ordered groups and quasi-ordered groups | 第8-13页 |
| 2 Hereditary and directed subsets of G_+ | 第13-16页 |
| 3 General closed θ-invariant subsets of Ω | 第16-23页 |
| 4 The largest closed θ-invariant proper subset of Ω | 第23-30页 |
| 致谢及声明 | 第30-32页 |