Or, as we will see soon, in a simply connected region.
稍后我们会知道，在一个单连通区域上也可以。
OK, so anyway, that's the customary warning about simply connected things.
总之，这是关于单连通的习惯性提醒。
OK, so space with the origin removed, OK, you think it's simply connected?
全空间去掉原点，它是单连通的吗？
OK, so space with the origin removed, OK, you think it's simply connected?
全空间去掉原点，它是单连通的吗？
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