數學上研究結嘅理論 From Wikipedia, the free encyclopedia
1927年,J.W. 亞歷山大同G.B. Briggs,以及 Kurt Reidemeister 獨立提出咗點樣判定兩個結係相同嘅方法:如果由一個結可以透過幾種基本嘅動作變成另一個結,佢哋就係相等嘅。呢啲動作稱為Reidemeister移動。
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