| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | Nonmonotonic Reasoning | .... 3 |
| 2.1 | Tree-structured Inheritance System | .... 3 |
| 2.2 | Temporal Projection | .... 4 |
| 3 | Reasoning in Tree-Structured Multiple Worlds | .... 6 |
| 4 | Formalism | .... 6 |
| 5 | Examples | .... 8 |
| 5.1 | Tree-structured Inheritance System | .... 8 |
| 5.2 | Temporal Projection | .... 9 |
| 6 | Related Research | .... 10 |
| 7 | Conclusion | .... 11 |
| Acknowledgments | .... 11 | |
| References | .... 11 | |
| Appendix A. | Proof of Theorems | .... 18 |
| Appendix B. | Deduction of the Properties | .... 21 |
| Appendix C. | Comparison with [Kautz86] | .... 26 |
| End | .... 32 |
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