# Math Help - Empty set

1. ## Empty set

Can the empty set be written in interval form as (infinity, infinity) or (infinity,a) U (b, infinity)?

2. Of course: $]a,b[$ where $a>b$

3. Originally Posted by summerset353
Can the empty set be written in interval form as (infinity, infinity) or (infinity,a) U (b, infinity)?
The real question is “does the empty set exist”?
Is that an idea for convenience?
Do mathematicians “hid there ignorance” in infinity and an empty set?