[Solution Library] Show that \mathcalB is generated by each of the following: The open intervals \mathcalE_1=(a, b): a The closed intervals \mathcalE_2=[a,
Question: Show that \(\mathcal{B}\) is generated by each of the following:
-
The open intervals \(\mathcal{E}_{1}=\{(a, b): a
- The closed intervals \(\mathcal{E}_{2}=\{[a, b]: a
- The half-open intervals \(\mathcal{E}_{3}=\{(a, b],[a, b): a
- The open rays \(\mathcal{E}_{4}=\{(a, \infty),(-\infty, b): a, b \in \mathbb{R}\}\).
- The closed rays \(\mathcal{E}_{5}=\{[a, \infty),(-\infty, b]: a, b \in \mathbb{R}\}\).
- The closed intervals \(\mathcal{E}_{2}=\{[a, b]: a
[Hint: It is easy to see that \(\mathcal{B}=\sigma\left(\mathcal{E}_{1}\right)\). In each of the remaining cases, you just need to show that \(\mathcal{E}_{1} \subset \sigma\left(\mathcal{E}_{i}\right)\) for \(i=2,3,4,5\). Why?]
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