| Extended Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | The NGHC(Nested Guarded Horn Clauses)language | .... 3 |
| 3 | The normalization of NGHC programs | .... 6 |
| 4 | A further reduction for NGHC programs in strong normal form | .... 7 |
| 5 | Unfolding rules for NGHC program | .... 8 |
| 6 | Unfolding and Fixpoint semantics | .... 10 |
| References | .... 12 | |
| Appendix | .... 14 | |
| End | .... 17 |
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