what is an improper subset?

An improper subset is identical to the set of which it is a subset.

For example:

Set *A*: {1, 2, 3, 4, 5}

Set *B*: {1, 2, 3, 4, 5}

Set *B* is an improper subset of Set *A* and vice versa ................ hope it helps...... thumbs up plzzzzz........