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**Al-Allo****Member**- Registered: 2012-08-23
- Posts: 310

If I had the following :

and I have put it in comprension notation :

{x∈R|12<equal x <equal15 and 15<equal x <equal 30 }

Is the comprehension notation good ?

*'and' means intersection in this case

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,916

Yes, that looks good to me.

Are you expected to simplify as well?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Al-Allo****Member**- Registered: 2012-08-23
- Posts: 310

What do you mean ??? How can it be more simplified ?

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,916

If x must lie in the region 12 to 15 AND in the region 15 to 30, then x must be ????

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**Al-Allo****Member**- Registered: 2012-08-23
- Posts: 310

Well the intersection is 15, if that's what you're asking

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