Math students learn about Ramsey problems early on, so r(4,t) has been on Verstraete's radar for most of his professional career. In fact, he first saw the problem in print in Erdös on Graphs ...

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#math'. The problem in question? 10×2÷4−2. What should be a basic calculation has some users confused, with commenters confidently posting contradicting answers. 'The answer is an easy 3 ...

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