One of the things I like about Quanta Magazine is their treatment of math - a mixture of very readable pieces on work at the frontier as well as well-written pieces that explain some of the basics. Here's a nicely done piece on how big is infinity...
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You might know that some sets of numbers are infinitely large, but did you know that some infinities are bigger than others? And that we’re not sure if there are other infinities sandwiched between the two we know best? Mathematicians have been pondering this second question for at least a century, and some recent work has changed the way people think about the issue.
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