# Countabilty

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• September 11th 2011, 09:43 AM
slevvio
Countabilty [SOLVED]
Hello, I just had a quick question about countability.

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, 09:56 AM
slevvio
Re: Countabilty [SOLVED]