Скачать или смотреть Union and intersection of finite number of open sets in R is an open set | DR Colleger

Union | Intersection | Open Set | Set in R | ‪@drcolleger‬

Content
0:00 Introduction
1:50 The Union of a finite number of open sets in R is an open set.
6:59 The intersection of a finite number of open sets in R is an open set.
15:12 The intersection of an infinite number of open sets in R is not necessarily an open set.

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