Question

If A - B={}, then A=B??

Answer 1

Suppose \(A=\{1\}\) and \(B=\{1,2,3\}\). What is \(A-B\) ?

Answer 2

A-B={}

Answer 3

it's a counter example to reply the question

Answer 4

It would be an {} because all the elements in A are in B as well, so A doesn't equal B.