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2023-09-10 17:38:27 +09:00
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commit 3c0c6a13ca
54 changed files with 266 additions and 132 deletions

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@@ -8,7 +8,9 @@ title: "04. Measurable Functions"
date: "2023-02-06"
github_title: "2023-02-06-measurable-functions"
image:
path: /assets/img/posts/mt-04.png
path: /assets/img/posts/Mathematics/Measure Theory/mt-04.png
attachment:
folder: assets/img/posts/Mathematics/Measure Theory
---
Lebesgue integral을 공부하기 전 마지막 준비입니다. Lebesgue integral은 다음과 같이 표기합니다.
@@ -153,7 +155,7 @@ $$s(x) = \sum_ {i=1}^{n} c_i \chi_ {E_i}(x).$$
여기서 $E_i$에 measurable 조건이 추가되면, 정의에 의해 $\chi_ {E_i}$도 measurable function입니다. 따라서 모든 measurable simple function을 measurable $\chi_ {E_i}$의 linear combination으로 표현할 수 있습니다.
![mt-04.png](../../../assets/img/posts/mt-04.png)
![mt-04.png](../../../assets/img/posts/Mathematics/Measure%20Theory/mt-04.png)
아래 정리는 simple function이 Lebesgue integral의 building block이 되는 이유를 잘 드러냅니다. 모든 함수는 simple function으로 근사할 수 있습니다.
@@ -206,7 +208,5 @@ $$f_n + g_n \rightarrow f + g, \quad f_ng_n \rightarrow fg$$
이고 measurability는 극한에 의해 보존되므로 $f+g, fg$ measurable이다.
[^1]: 일반적으로는 measurable set의 preimage가 measurable이 정의합니다.
[^2]: 참고로 $\infty - \infty$ 경우는 정의되지 않으므로 생각하지 않습니다.
[^3]: 정의에서 $\infty - \infty$ 나타나지 않음에 유의해야 합니다.