# Countabilty

• September 11th 2011, 10:43 AM
slevvio
Countabilty [SOLVED]

Let $A$ be a countable set, so there exists a map $f: A \rightarrow \mathbb{N}$ such that $f$ is injective. How can I show that there is a bijection between these sets?

Any help would be appreciated.
• September 11th 2011, 10:56 AM
slevvio
Re: Countabilty [SOLVED]