| Abstract | .... 2 | |
| Keywords | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | Unford/fold Transformation | .... 4 |
| 2.1 | Preliminaries; Rules of Transformation | .... 4 |
| 2.2 | Modified Folding Rule and Preservation of FF | .... 6 |
| 3 | Unford/Fold Transformation of Stratified Programs | .... 9 |
| 3.1 | Preliminaries | .... 9 |
| 3.2 | Partial Correctness of Transformation | .... 10 |
| 3.3 | Total Correctness of Transformation | .... 11 |
| 4 | On Preservation of Perfect Model Semantics | .... 12 |
| 5 | Conclusion | .... 13 |
| Acknowledgements | .... 13 | |
| References | .... 14 | |
| A Appendix | .... 15 | |
| End | .... 34 |
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