Math Help - countable sets

1. countable sets

Let p = {X E P(Z+) | X is finite) . Prove that P is denumerable

2. Originally Posted by mathsohard
Let p = {X E P(Z+) | X is finite) . Prove that P is denumerable
To clarify

p is the set of all finite subsets of the positive integers.

This is a denumerable union of denumerable sets (the set of all sets of positive integers with n elements is denumerable).

CB