Question

Which of the following has no solution?

{x | x < 0} and {x | x > 0}
{x | x ≤ 0} and {x | x ≥ 0}
{x | x ≤ 0} or {x | x ≥ 0}

Answer 1

{x | x < 0} and {x | x > 0}
?

Answer 2

@xapproachesinfinity

Answer 3

well do you think a set can be both negative and positive at the same time?

Answer 4

and means intersection (what the sets have in common)
do the set of positive numbers and the set of negative numbers have any numbers in common?