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Jul 25, 2016 at 17:49 vote accept Basil
Jun 12, 2014 at 18:16 comment added Terry Tao In the same vein: $A$ is some arbitrary collection of sets, and $a \smile b$ if $a \cap b \neq \emptyset$. Then singleton sets have the property (*).
Jun 12, 2014 at 15:50 history answered Ramiro de la Vega CC BY-SA 3.0