龐加萊懸想
龐加萊懸想者，所以論三維空間之同胚於三次元球面也，即以 ( x , y , z ) 示其位。若球面之同胚於平面，均守四色定理，均可以 ( x , y ) 示其位，然面包圈弗之，今已爲數學家所證矣。
據
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