| Abstract | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Utility of Hypothetical Reasoning | .... 3 |
| 3 | General Formalism | .... 4 |
| 3.1 | Supporting Hypotheses | .... 4 |
| 3.2 | Beliefs and Extensions | .... 6 |
| 4 | Truth Maitenance Systems | .... 7 |
| 4.1 | de Kleer's ATMS;Keeping All Extensions | .... 8 |
| 4.2 | Doyle'sTMS;Selecting One Model | .... 9 |
| 4.3 | Assumption-based versus Justification-based | .... 10 |
| 5 | Conclusion | .... 11 |
| References | .... 11 |
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