열린집합,open_set Copy: 열린집합,open_set has comma Hide Show 열린집합,open_set (rev. 1.2) 개집합 opp. 닫힌집합,closed_set 열린집합 = https://ko.wikipedia.org/wiki/열린집합 Open_set = https://en.wikipedia.org/wiki/Open_set Up: 집합,set