| Abstract | .... 2 | |
| Keywords | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Classical Nagation and Consistency | .... 5 |
| 3 | Theoy Formation | .... 8 |
| 3.1 | Default Reasoning | .... 9 |
| 3.2 | Closed World Assumption | .... 10 |
| 3.3 | Abduction | .... 12 |
| 4 | Reuction to Extended Logic Programs | .... 14 |
| 4.1 | Simple Default Assumption | .... 14 |
| 4.2 | Complex Default Assumption | .... 21 |
| 5 | Discussion | .... 25 |
| 5.1 | Reduction to General Logic Programs | .... 25 |
| 5.2 | Abductive Logic Programming | .... 27 |
| 5.3 | Inoconsistency Resolution | .... 28 |
| 5.4 | Priority | .... 29 |
| 6 | Conclusion | .... 30 |
| Acknowledgement | .... 31 | |
| References | .... 31 | |
| End | .... 32 |
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