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给出可拓集经典域与可拓域、可拓域与非域的边界关联函数值K(?)(u)=0,-1的新定义,从而得到了新的可拓集结构。
The new definition of the boundary function value K(?)(u)=0,-1 for extension set classical domain and extension domain, extension domain and non-domain is given, and a new extension set structure is obtained.