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This commit is contained in:
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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@@ -8,10 +8,12 @@ title: "02. Construction of Measure"
date: "2023-01-23"
github_title: "2023-01-23-construction-of-measure"
image:
path: /assets/img/posts/mt-02.png
path: /assets/img/posts/Mathematics/Measure Theory/mt-02.png
attachment:
folder: assets/img/posts/Mathematics/Measure Theory
---
![mt-02.png](../../../assets/img/posts/mt-02.png)
![mt-02.png](../../../assets/img/posts/Mathematics/Measure%20Theory/mt-02.png)
이제 본격적으로 집합을 재보도록 하겠습니다. 우리가 잴 수 있는 집합들부터 시작합니다. $\mathbb{R}^p$에서 논의할 건데, 이제 여기서부터는 $\mathbb{R}$의 구간의 열림/닫힘을 모두 포괄하여 정의합니다. 즉, $\mathbb{R}$의 구간이라고 하면 $[a, b], (a, b), [a, b), (a, b]$ 네 가지 경우를 모두 포함합니다.
@@ -199,7 +201,7 @@ $$\mu^\ast(A) + \mu^\ast(B) = \mu^\ast(A\cup B) + \mu^\ast(A \cap B)$$
같이 정의하면 $A_n$ 쌍마다 서로소이고 $A_n \in \mathfrak{M} _ F(\mu)$ 임을 있다.
사실을 이용하여 $A_n \in \mathfrak{M} _ F(\mu)$ 에 대하여 $A = \displaystyle\bigcup_ {n=1}^\infty A_n$ 으로 두자.
사실을 이용하여 $A_n \in \mathfrak{M} _ F(\mu)$ 에 대하여 $A = \displaystyle\bigcup_ {n=1}^\infty A_n$ 으로 두자.
1. Countable subadditivity에 의해 $\displaystyle\mu^\ast(A) \leq \sum_ {n=1}^{\infty} \mu^\ast (A_n)$ 성립한다.
@@ -254,9 +256,6 @@ $$A_n \cap B = \bigcup_ {k=1}^\infty (A_n \cap B_k) \in \mathfrak{M}(\mu)$$
이제 $\Sigma$ 위의 $\mu$ 정의를 $\mathfrak{M}(\mu)$ ($\sigma$-algebra) 확장하여 $\mathfrak{M}(\mu)$ 위에서는 $\mu = \mu^\ast$ 정의합니다. $\Sigma$ 위에서 $\mu = m$ , 이와 같이 확장한 $\mathfrak{M}(m)$ 위의 $m$ **Lebesgue measure** on $\mathbb{R}^p$ 합니다. 그리고 $A \in \mathfrak{M}(m)$ Lebesgue measurable set이라 합니다.
[^1]: $A$ open이 아니면 자명하지 않은 명제입니다.
[^2]: $A$ $\mu$-measurable인데 $\mu^\ast(A) < \infty$이면 $A$ finitely $\mu$-measurable이다.
[^3]: $A$ countable union of sets in $\mathfrak{M} _ F(\mu)$이므로 $\mu^\ast$ set의 $\mu^\ast$ 합이 된다.
[^4]: 아직 증명이 끝나지 않았습니다. $A_n$ $\mathfrak{M}(\mu)$ 원소가 아니라 $\mathfrak{M} _ F(\mu)$ 원소입니다.