@christianp Nice. I wish there were a way to do the same at arXiv, but things are a bit too dense there.
What I use most often at arXiv does work at MathWorld though: http://mathworld.wolfram.com/search/?query=%22open+problem%22
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
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