On the van Kampen theorem
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[1] W. Blankinship,et al. Remarks on certain pathological open subsets of 3-space and their fundamental groups , 1950 .
[2] E. Artin,et al. Some Wild Cells and Spheres in Three-Dimensional Space , 1948 .
暂无分享，去创建一个
[1] W. Blankinship,et al. Remarks on certain pathological open subsets of 3-space and their fundamental groups , 1950 .
[2] E. Artin,et al. Some Wild Cells and Spheres in Three-Dimensional Space , 1948 .