Comment on Derivatives don't always act like fractions (2021)parentComments−yccs271yThis is the crucial insight. The last proof in TFA writes it in differential form notation, where "dx at constant y" is dx∧dy = -dy∧dx.
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This is the crucial insight. The last proof in TFA writes it in differential form notation, where "dx at constant y" is dx∧dy = -dy∧dx.