# Real Analysis

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1. Define: Exterior Measure
If  is any subset of , the exterior measure of  where  is any countable covering of E.
2. Define: Measurable set
A set  of  is measurable if for all  positive there exists and open set  such that .
3. What are the 6 properties of Measure ?
• 1) Every open set is measurable.
• 2) If the set has exterior measure zero it is measurable.
• 3) The countable union of measurable sets is measurable.
• 4) Closed sets are measurable.
• 5) The complement of a measurable set is measurable.
• 6) The countable intersection of measurable sets is measurable.
4. Why is exterior measure insufficient. property does measure have the exterior measure not?
Measure of the union is equal to the sum of the measures when the sets are disjoint. This is not true for exterior measure.
5. Define: Measurable Function.
a function  defined on a set E, is measurable if for all  the set  is measurable.
6. What types of functions are measurable?
• 1)(finite valued) is measurable if and only if and only if  is measurable for every open set.
• 2) Continuous functions are measurable.
• 3) If  is a sequence of measurable functions, all of the following are measurable.
 Author: NhanNguyen ID: 225589 Card Set: Real Analysis Updated: 2013-07-02 02:13:28 Tags: Analysis Math Folders: Description: Definitions and Theorems about Measure and Integration. Show Answers: