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Today's #dailymaths CHALLENGE PROBLEM. Problems are taken from the Mathematics 2021 calendar. Each day's problem is posted at 1am Eastern/6am London. Previous day's solution is added a few hours later. Guest mathematician posts welcome; DM if interested! 
Yesterday's problem with solution by me, and link to extended explanation in the next tweet!
Here is a fabulous explanation of modular arithmetic by @drrollergator -- easily accessible by middle schoolers, even though most people only learn it in number theory at university. Spend your Sunday learning something amazing!
Today's #dailymaths CHALLENGE PROBLEM. Problems are taken from the Mathematics 2020 calendar. Each day's problem is posted at 2am Eastern/7am London. Previous day's solution is added a few hours later. Guest mathematician posts welcome; DM if interested!
Yesterday's problem with a special series of answers! The answer is as simple as checking a list of the ten problems Hilbert revealed on August 8, and seeing that the Riemann is #8. But what about those problems? Why are they so special, and what do they mean? Keep reading!
Two professors, one retired and one current, wrote plain-English explanations of some of the Hilbert problems for us. Here is the first, problem #1, explained by @JohnsonFido.
