# Thread: set builder notation

1. ## set builder notation

Hi!

If I want to write 1,2,3,4 and 5 in set notation I would (I presume) write {x E N : 1 <= x <= 5}. But how do I write 1,1.5,2,2.5,3,3.5,4,4.5,5 in set notation?

2. Originally Posted by ErikaAnderssen
Hi!

If I want to write 1,2,3,4 and 5 in set notation I would (I presume) write {x E N : 1 <= x <= 5}. But how do I write 1,1.5,2,2.5,3,3.5,4,4.5,5 in set notation?
How about $\left\{\tfrac{n}{2}\;:\; n\in\mathbb{N}, 2\leq n \leq 10\right\}$?

3. Thank you