Elekes-Rónyai Theorem revisited

Mario Huicochea

In this paper it is proven that for any $f\in \mathbb{R}(x_1,x_2)$ and $A_1,A_2$ nonempty finite subsets of $\mathbb{R}$ such that $|A_1|=|A_2|$ and $f$ is defined in $A_1\times A_2…