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  1. ; ; (, Forum of Mathematics, Sigma)
    Abstract Erdős [7] proved that the Continuum Hypothesis (CH) is equivalent to the existence of an uncountable family $$\mathcal {F}$$ of (real or complex) analytic functions, such that $$\big \{ f(x) \ : \ f \in \mathcal {F} \big \}$$ is countable for every x . We strengthen Erdős’ result by proving that CH is equivalent to the existence of what we call sparse analytic systems of functions. We use such systems to construct, assuming CH, an equivalence relation $$\sim $$ on $$\mathbb {R}$$ such that any ‘analytic-anonymous’ attempt to predict the map $$x \mapsto [x]_\sim $$ must fail almost everywhere. This provides a consistently negative answer to a question of Bajpai-Velleman [2]. 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Stem Cell Reports)
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