Question

What is the solution set of {x | x < -3} ∩ {x | x > 5}?

all numbers except -3 and 5
the numbers between -3 and 5
the empty set
all real numbers

Answer 1

The first is,
`the set of x's such that x is less than -3`:
{ ... , -6, -5, -4 }

The second is,
`the set of x's such that x is greater than 5`:
{ 5, 6, 7, 8, ... }

What values do these sets have in common?
That's what the `intersection` is asking for.
Any ideas? :)