環圈

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[1]

环面上的二個環圈ab

相關條目

參考資料

  1. Adams, John Frank, , Annals of mathematics studies 90, Princeton University Press: 3, 1978, ISBN 9780691082066.
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