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I just learned that a question of mine on minimal vertex covers in hypergraphs where edges intersect in at most $1$ point led to a paper by Lajos Soukup and Tamas Csernak; it will appear in Discrete ...
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Garabed Gulbenkian's 2010 question about ordinal definable real numbers, which Joel David Hamkins called "a fascinating, outstanding question," attracted considerable attention, culminating ...
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Zhi-Wei Sun posted a highly upvoted MO question in 2018, Can we write each positive rational number as ${1\over p_1−1}+\cdots+{1\over p_k−1}$ with $p_1,\ldots,p_k$ distinct primes? The question ...
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