Let \(\mathbb{R}\) be the set of real numbers and let \(\mathbb{N}\) be the set of positive integers. Does there exist a function \(f:\mathbb{R}^3\to \mathbb{N}\) such that f(x,y,z)=f(y,z,w) implies x=y=z=w?
The best solution was submitted by Yang, Hae Hun (양해훈), 2008학번. Congratulations!
Here is his Solution of Problem 2008-9.
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