simply-connected region 单连通区域
not simply connected region [计] 非单连通区域
a simply-connected region 单连通区域
a simply connected region 单连通区域
periodic simply connected region 周期单连通区域
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 where do we use the assumption of being defined in a simply connected region?
那么我们是在哪里利用了，“定义在单连通区域”的假设呢？
Let's not worry too much about it. For accuracy we need our vector field to be defined in a simply connected region.
对于它，不用太担心，为了精确起见，需要向量场定义在一个单连通区域中。
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