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@meresar_math Libretexts does some cool stuff, but their scale comes from "harvesting" open licensed works and rehosting. It's unclear to me if anyone is "responsible" for these harvested works as the authors often aren't involved at all.
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@meresar_math So in general I'd encourage you to look up the authors and see if they are maintaining the work still, and consider helping them directly if so, and consider using their content directly.
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@meresar_math (it's possible the obvious typos are a result of harvesting incorrectly from the original source, but that's just a guess)