基于TNF的历史关系模式达到3TNF的分解

The Decomposition of Historical Relational Schemes from TNF to 3TNF

对基于TNF的历史关系模式TU，提出了时间依赖、2TNF、3TNF等重要概念，并给出了TNF达到3TNF的模式分解算法及证明，解决了历史关系模式中存在的数据冗余、TNF异常等问题。

The paper first introduces some important concepts on the historical relational scheme based on TNF, including time dependence, 2TNF，3TNF and so on, and then gives the algorithm and proof decomposi ng from TNF to 3TNF for the Historical Relational Scheme, this resolves data redundancy and TNF abnormal in the historical relational scheme.