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A combinatorial property of cardinals
Authors:  ter Komjá  th  Mikló  s Laczkovich
Institution:Department of Computer Science, Eötvös University, P.O. Box 120, 1518, Budapest, Hungary ; Department of Analysis, Eötvös University, P.O. Box 120, 1518, Budapest, Hungary
Abstract:(GCH) For every cardinal $\kappa \ge \omega_2$ there exists $F:\kappa]^{\le 2} \to \{ 0,1\}$ such that for every $f: \kappa\to \kappa]^{<\omega}, i < 2$, there are $x,y$ such that $F(x,t)=i (t\in f(y)), F(u,y)=i (u\in f(x))$.

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