Question 86
Is it possible to color all rational numbers with one of two colors, so that if $x, y \in \mathbb{Q}$, $x \neq y$, $xy = 1$ or $x + y \in \{0, 1\}$ then $x$ and $y$ must be colored with different colors.
Math Olympiad Vault · MathNet 2010 — Part 04