강풀화1 [1062561] · MS 2021 · 쪽지

2024-06-02 17:18:30
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Proof of Heine-Borel theorem(일부)

게시글 주소: https://m.orbi.kr/00068257831

Heine-Borel theorem


Let K be the subset of R(set of real numbers)


Then the following are equivalent


(a) K is closed and bounded

(b) K is compact

(c) Every infinite subset of K has a limit point in K



proof of (c)=>(a)



(i) Claim 1: K is bounded





(ii) Claim 2: K is closed



진짜 기말 공부하면서 제일 머리 터지는 곳이 compact set인듯

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