**Exercise 1. **Show that the -algebra is also generated by the following families:

- where and where are Borel sets in .
- where and where is a Borel set in .

**Exercise 2. ***S*how that the following sets are in :

**Exercise 1. **Show that the -algebra is also generated by the following families:

- where and where are Borel sets in .
- where and where is a Borel set in .

**Exercise 2. ***S*how that the following sets are in :

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