| Abstract | .... 2 | |
| 1 | Introduction | .... 2 |
| 2 | To Formalize Various Types of Conjectural Reasoning | .... 3 |
| 3 | Ascription Schema | .... 5 |
| 4 | Application of Ascription to Various Type of Cojectural Reasoning | .... 8 |
| 4.1 | Reasoning in the Extremes, Circumscription and Inscription | .... 9 |
| 4.2 | Analogical Inference | .... 9 |
| 4.3 | Inductive Inferece | .... 10 |
| 4.4 | Default Reasoning | .... 11 |
| 5 | Model Theory of Ascription | .... 12 |
| 6 | Consistency of Ascription | .... 13 |
| 6.1 | Conclusion and Remarks | .... 14 |
| Acknowledgments | .... 15 | |
| References | .... 15 | |
| Appendix | .... 16 | |
| End | .... 18 |
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