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## #1 2013-08-24 09:23:50

Al-Allo
Member
Registered: 2012-08-23
Posts: 324

### Set question

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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## #2 2013-08-24 18:58:43

bob bundy
Moderator
Registered: 2010-06-20
Posts: 7,738

### Re: Set question

Yes, that looks good to me.

Are you expected to simplify as well?

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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## #3 2013-08-25 02:24:11

Al-Allo
Member
Registered: 2012-08-23
Posts: 324

### Re: Set question

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

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## #4 2013-08-25 04:11:34

bob bundy
Moderator
Registered: 2010-06-20
Posts: 7,738

### Re: Set question

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

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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## #5 2013-08-25 04:41:05

Al-Allo
Member
Registered: 2012-08-23
Posts: 324

### Re: Set question

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

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