Is there any polynomial $f(x,y)\in{\mathbb Q}[x,y]{}\ $ such that $f:\mathbb{Q}\times\mathbb{Q} \rightarrow\mathbb{Q}$ is a bijection?

## **protected** by Andrés Caicedo Dec 5 '13 at 14:23

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injectivef? – Tom Leinster Apr 11 '10 at 17:56