The logic operations of the extension set are discussed. As applications, we give some results of extension ranges and stable ranges, which are the mathematical bases of the extension logic.

• 摘要讨论可拓集合逻辑运算的定义及其运算性质，获得了关于可拓域和稳定域的某些结果，它们是可拓逻辑的数学基础。