Not a fan of these, but this one certainly has it's charm:

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@j Putting the word "positive" in there was the work of an admirably cruel mind.

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Mathstodon

A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.

Use \( and \) for inline LaTeX, and \[ and \] for display mode.