| Abstract | .... 3 | |
| 1 | Introduction | .... 4 |
| 2 | Preliminaries | .... 6 |
| 3 | Common Language | .... 7 |
| 3.1 | Order Structure | .... 7 |
| 3.2 | Validity | .... 9 |
| 3.3 | Axiomatization | .... 12 |
| 4 | Comparison | .... 15 |
| 4.1 | Consequence Relation | .... 15 |
| 4.2 | Knowledge Base Revision | .... 16 |
| 4.3 | Knowledge Base Update | .... 19 |
| 4.4 | Conditional Logic | .... 21 |
| 5 | Reciprocal Relation | .... 21 |
| 5.1 | Consequence Relation versus Revision | .... 21 |
| 5.2 | Consequence Relation versus Conditional Logic | .... 22 |
| 5.3 | Revision versus Conditional Logic | .... 22 |
| 5.4 | Update versus Conditional Logic | .... 23 |
| 6 | Concluding Remarks | .... 23 |
| Acknowledgements | .... 24 | |
| References | .... 24 | |
| End | .... 26 |
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