| 关系代数及其表示理论 |
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| 引用本文： | 张毅 宋方敏. 关系代数及其表示理论[J]. 南京师大学报(自然科学版), 1996, 19(1): 23-26 |
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| 作者姓名： | 张毅 宋方敏 |
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| 作者单位： | 南京林业大学基础部，南京大学计算机科学系 |
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| 摘 要： | 讨论了带＊算子的关系代数，提出单原子的概念并借助于它给出关系代数与集上关系代数同构的充要条件以及关系代数与集上代数的子代数同构的充分条件，并给出关系代数的表示定理。
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| 关 键 词： | 关系代数 表示理论 算子 |
The Relational Algebra and its Representation Theory |
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| Zhang Yi,Song Fangmin. The Relational Algebra and its Representation Theory[J]. Journal of Nanjing Normal University(Natural Science Edition), 1996, 19(1): 23-26 |
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| Authors: | Zhang Yi Song Fangmin |
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| Abstract: | In this paper,we study the relational algebra with *-operator. Some properties of this algebra are proved. We give out the sufficient and necessary condition about that a relational algebra is isomorphic to a relational algebra over a set,and the sufficient condition about that a relational algera is isomorphic to a subalgebra of a relational algebra over a set. So we show the representation theorem of the relational algebra. |
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| Keywords: | relational algebra representation theory opertor |
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