In the paper researches on a three-dimensional measure-Preserving mapping system are made, which is the three-dimensional extension of the Keplerian map-ping.
本文通过构造形式级数的方式，给出了一种三维保测度映射系统中一维不变流形和二维不变流形的计算方法。
We have studied the KS entropy of a 2-dimensional measure-preserving mapping with an elliptic or hyperbolic fixed point respectively, as well as that of its 3-dimensional extension.
我们已经研究了分别具椭圆和双曲不动点的二维保测度映射及其受摄三维扩张的KS熵。
This paper proposes a kind of method that can preserve integrity constraints in data mapping, contrives a mechanism(DAPPIC)of generating constraints-preserving publishing rules.
提出一种在数据映射方式下保持完整性约束的数据发布方法，设计了一套保持完整性约束的数据发布规则生成机制DAPPIC。
The order-preserving doubly mapping on a Boolean algebra equivalents to symmetry operation;
布尔代数上保序对合映射与对称运算等价；
The order-preserving doubly mapping on a Boolean algebra equivalents to symmetry operation;
布尔代数上保序对合映射与对称运算等价；
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