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Why is this on top of HN? There are so many websites teaching introductions to differential equations. Is there something interesting about this one in particular?

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They're pretty much the best calc notes I've seen, was very useful a few years ago

Paul’s Online Notes are a pretty well-known calculus and differential equations reference. IMO they’re pretty decent.

Paul's Online Notes is my childhood. There's something nostalgic about seeing this submission.

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