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Ponder This
OK, this is not exactly about a particular open question, but I just thought that maybe you will be interested. IBM Research’s Ponder This features a problem every month and is open to everyone. Check...
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An Annoying Combinatorial Problem
Here is an “innocent” combinatorial problem, with the best known bounds being very simple (but nobody managed to improve them since 1978). Disclaimer: the problem is very catchy (I struggled with it...
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