Read Edit View history 闭集 bìjí closed set Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 闭集/閉集 · bìjí · closed set 2026/03/04 闭集 / 閉集 bìjí closed set closed set (math.) 在拓扑学中，闭集是开集的补集。 created sense Mar 4, 2026, 02:25 AM