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- Jun 28th 2008, 08:02 PM #1

- Joined
- Jul 2007
- Posts
- 13

## What is really SF ?

Is it true that S´F is equal to the set of all countable unions of measurable rectangles? If so could you prove it, if not what is a contradictory example .Let's S be a s-algebra in X and F be a s-algebra in Y .S´F is defined as the smallest s-algebra in X ´ Y containing all measurable rectangles .