Math Is Fun Forum

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

Bob

Administrator

Registered: 2010-06-20

Posts: 10,803

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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Al-Allo

Member

Registered: 2012-08-23

Posts: 324

Re: Set question

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

Bob

Administrator

Registered: 2010-06-20

Posts: 10,803

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
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Al-Allo

Member

Registered: 2012-08-23

Posts: 324

Re: Set question

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