Sign up ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

What is $[1, 5] \cap [4, 5[$? Is it $[4, 5[$ or $[4, 5]$ ?

Correct me if I'm wrong:

$A = [1,5]$ includes $\{1, 1.34, 3.23, 4, 5 \}$, and $B = [4, 5[$ includes $\{4.32, 4.44, 4.99\}$. So if I intersect $A$ and $B$, I get all value between $[4, 5[$.

Am I right? Also if it is a $A \cup B$, would it be $[1, 5]$?

share|cite|improve this question

1 Answer 1

up vote 4 down vote accepted

Yes you are right. But there are more numbers in $A$ and $B$ than what you listed.

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.