Also known as closed loop, closed curve, closed path
in mathematical topology, a path whose initial point is equal to its terminal point
數學中的環圈（loop）是拓扑空间X上的连续函数f，其定義域為单位区间I = [0,1]，而且f(0) = f(1)。換句話說，環圈是拓扑學中，起點和終點相同的道路。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).