arithmetic of substract

• 1. 对称差运算: operation of symmetric difference | Symetric difference operation
• 2. 布尔差运算: subtract of the Boolean operation
• 3. 均差运算: divided difference operation

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• 1.通过对岩石试样在加载前后测得的CT数作差值运算，可获得岩石试样在不同应力阶段的CT密度损伤增量。
  Rock density damage increment with ct can be obtained by subtracting ct number of the undisturbed rock samples from that of the loaded rock samples.
  www.rockmech.org
• 2.异构数据源的合成是数据集成的一项重要功能，功能涉及数据冲突解决、数据复制和复杂的数据源交并差运算等。
  Heterogeneous data synthesis is an important function of data integration. It involves data conflict resolution, data replication and more complex operation such as join, merge and difference.
  dict.youdao.com
• 3.在同一三向DEXEL模型空间，实现并、交、差布尔运算。
  Under the same three directions DEXEL space, Boolean operations such as union, intersection, and subtraction are implemented.
  dict.cnki.net

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