Question

Please help!


If A = {positive integers} and B = {…,−4, −3, −2, −1} what is A ∩ B?

Answer 1

since none of the numbers in set B are positive, there is nothing in the intersection

Answer 2

so somehow you have to say the set \(A\cap B\) is empty
there are a couple of ways to do this
you can write
\[A\cap B=\emptyset\] or sometimes
\[A\cap B=\{\}\]

Answer 3

Thank you

Answer 4

yw