A countable set is an infinite set that has a bijection with the natural numbers. Each natural number can be associated with an element of a countable set. Thus, any element in the set can be "reached" simply by counting long enough.
A countable set is an infinite set that has a bijection with the natural numbers. Each natural number can be associated with an element of a countable set. Thus, any element in the set can be "reached" simply by counting long enough.
