APP description

Generally, when A and B are two sets, then all the sets of elements belonging to A and not belonging to B are called set A minus set B (or the difference between set A and set B),Similarly, for sets A, B, we call the set {x∣x∈A, and x∉B} the difference between A and B.

Usage example

Input collection (U) (English comma, separated): 1, 2, 3

Input collection (A) (English comma, separated): 2, 3

Click "Calculate" to output the result

Difference: 1