lol who has time for this just rederive it from first principleshttps://twitter.com/stephenkinsella/status/1203939213642784769 …
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"dx and dy are the Ghosts of departed Quantities" https://en.wikipedia.org/wiki/The_Analyst#Ghosts_of_departed_quantities …
I might need to give context to the rest of the quote for it to make sense. There's some historical baggage and shit throwing going on that may be lost to the average reader.
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