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정리2.35인데 adjoined 가 뭔 뜻인질 모르겠다 ㅠ 교집합이 있다는거임?
또 adjoined 할 때 왜 K의 open cover가 존재하는건지도

멍청이 구제해줄 사람 구함ㅎㅎ