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Lebesgue measurable sets.

The following sets meet the criteria to be Lebesgue measurable:

1. Every [...] set is Lebesgue measurable.
2. A countable [...] of Lebesgue measurable sets is Lebesgue measurable.
3. Every [...] set is Lebesgue measurable.
4. The [c________] of a Lebesgue measurable set \( E \) is Lebesgue measurable.
5. A countable [...] of Lebesgue measurable sets is Lebesgue measurable.

Two others are:

• Every set of Lebesgue outer measure [...] is measurable. These sets are called [...] sets.
• The empty set \( \emptyset \) is Lebesgue measurable.

The proofs are on the reverse side, along with a repeat of the definition of Lebesgue measurability.