| Abstract | .... 2 | |
| contents | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Unfold/Fold Transformation of Prolog Programs | .... 3 |
| 3 | Preservation of Stornger Equivalence | .... 5 |
| 3.1 | Proof Tree | .... 5 |
| 3.2 | Mapping between Proof Tree Sets | .... 7 |
| 3.3 | Partial Correctness | .... 8 |
| 3.4 | Total Correctness | .... 11 |
| 4 | Discussion | .... 19 |
| 5 | Conclusions | .... 19 |
| Acknowledgements | .... 19 | |
| References | .... 20 |
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