Geometric Proof of the Fundamental Theorem of Calculus by Sir Isaac Barrow. Sir Isaac Barrow was Sir Isaac Newton's teacher at Cambridge if I am not mistaken. Newton downplayed his role as I understand it ...
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This is difficult to navigate due to the notation, however, as a math teacher we certainly know what the result is going to be! I would love to review this with someone at some point. The last time I did this was in the 90s ...