| Abstract | .... 3 | |
| 1 | Introduction | .... 3 |
| 2 | Logic W and its Main Properties | .... 5 |
| 3 | Multi-agent Weak S5 Systems | .... 8 |
| 4 | Relationship between KD4 and W | .... 10 |
| 5 | Relationship between W and S4 | .... 11 |
| 6 | Conclusion | .... 14 |
| Acknowledgements | .... 14 | |
| References | .... 14 | |
| End | .... 16 |
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