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In Cooper's book, I can't think out the solutions of two exercises.

1.show that there exists a simple set S contains the set of all even numbers.

2.show that each creative set is contained in some simple set.

By the way,they are not homework question.

I read the book on my own and I am a beginner. Thanks for your hint.

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    For (1) you could probably take a known simple set $A$, and define $B = \{ 2n+1 : n \in A \} \cup \{ 2n : n \in \mathbb{N} \}$.2012-02-22
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    Thank you very much. My question may be too simple, Your answer is really helpful since I am a autodidact and a beginner in this area.2012-02-23

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