第三范式（The Third Normal Form） 定义：如果一个关系属于2NF，且每个非关键字不传递依赖于主关键字，这种关系是3NF。 从2NF中消除传递依赖，就是3NF。
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Most experts would suggest that designers strive to follow the first three rules, so that the data is said to be in third normal form.
大多数专家都会建议设计者尽量遵从前三条规则，由此得到的数据就可以说是符合第三范式。
An improved adjoint operator method is employed to compute the third order normal form of six dimensional nonlinear dynamical systems and the associated nonlinear transformation for the first time.
本文首次用一种改进的共轭算子法研究了六维非线性系统的三阶规范形以及所用的非线性变换。
Finally, the MAPLE symbolic program for calculating the third order normal form is given. The concrete normal form of six dimensional nonlinear systems is obtained.
最后用MAPLE符号算法语言编写计算程序，给出了六维非线性系统的三阶规范形的具体形式。
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