請問 Munkres 的 Topology 2ed
P.335 的第三題
Let x_0 and x_1 be points of the path-connected space X.
Show that π_1(X,x_0) is abelian if and only if for every pair α and β of
paths from x_0 to x_1, we have α-hat = β-hat.
從左證到右我會，那從右證到左呢？
本想直接檢查，但看不出來。
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