| ABSTRACT | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Definition of the language and interpretations | .... 4 |
| 3 | The definition of the language for model theoretic statements | .... 7 |
| 4 | Relations over interpretations | .... 10 |
| 5 | Application to formalizing nonmonotonic reasoning | .... 18 |
| 5.1 | Formula Circumscription | .... 18 |
| 5.2 | Parallel Circumscription | .... 18 |
| 5.3 | Simple Default Reasoning | .... 19 |
| 5.4 | Prioritized Default Reasoning | .... 20 |
| 5.5 | Minimal Change Models | .... 21 |
| 5.6 | Relative Plausibility | .... 23 |
| 6 | Discussion | .... 24 |
| 6.1 | Reasoning of Inequality | .... 24 |
| 6.2 | Conditional Probability | .... 25 |
| Acknowledgments | .... 25 | |
| References | .... 25 | |
| End | .... 26 |
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