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| A Comparison of Closed World Assumptions | |
| 作者姓名： | 沈一栋 |
| 作者单位： | Dept. of |
| 摘 要： | In this paper, we introduce a notion of the family of closed world assumptions and compare severalwell-known closed world approaches in the family to the extent to which an incomplete database is com-pleted. |
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