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