| Abstract | .... 2 | |
| Contents | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Unfold/Fold Transformation of Prolog Programs | .... 3 |
| 3 | Preservation of Stronger Equivalence | .... 5 |
| 3.1 | Proof Tree | .... 5 |
| 3.2 | Partial Correctness | .... 7 |
| 3.3 | Total Correctness | .... 10 |
| 4 | Discussion | .... 16 |
| 5 | Conclusion | .... 16 |
| Acknowledgements | .... 16 | |
| References | .... 16 | |
| End | .... 17 |
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