| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | The Language of QPC | .... 3 |
| 2.1 | Term of QPC2 | .... 3 |
| 2.2 | Type of QPC2 | .... 4 |
| 2.3 | Formula of QPC2 | .... 5 |
| 2.4 | Scheme | .... 5 |
| 3 | The Rules of QPC2 | .... 6 |
| 3.1 | Rules on Scheme Calculus | .... 6 |
| 3.2 | Type Rules | .... 7 |
| 3.3 | Logical Rules | .... 9 |
| 3.4 | Some Properties | .... 10 |
| 4 | Program Extraction | .... 11 |
| 4.1 | qpc-realizability | .... 11 |
| 4.2 | Properties of qpc-realizability | .... 12 |
| 4.3 | Optimization | .... 16 |
| 5 | Writing Specifications | .... 16 |
| 5.1 | Map Function | .... 16 |
| 5.2 | Sorting program | .... 18 |
| 5.3 | Use Defined Rules of Inference | .... 18 |
| 6 | Examples of Program Extraction | .... 19 |
| 7 | Discussion and Conclusion | .... 21 |
| Acknowledgement | .... 22 | |
| References | .... 22 | |
| End | .... 23 |
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