| Abstract | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Two Aspect of Hypothetical Reasoning | .... 3 |
| 3 | General Formalism | .... 4 |
| 3.1 | Supporting Hypotheses | .... 4 |
| 3.2 | Belifes | .... 7 |
| 3.3 | Extensions | .... 7 |
| 4 | Truth Maintenance Systems | .... 8 |
| 4.1 | de Kller's ATMS | .... 8 |
| 4.2 | Doyle's TMS | .... 10 |
| 4.3 | Discussion | .... 11 |
| 5 | Conclusion | .... 11 |
| Acknowledgments | .... 11 | |
| References | .... 11 | |
| End | .... 12 |
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