The "notational second derivative" is true only when the function 𝑓(𝑥) is of a very specific form 
pic.twitter.com/ZFTgHFcqxp
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On his computer probably with Overleaf or something
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That's where I write all my papers lol. Well, sharelatex first but now overleaf
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that's disgusting [blocked]
End of conversation
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