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@Gallchobhair, they both invented it at about the same time independent of each other in a weird twist. ironically liebenez invented calculus we learned in high school. Newton’s version is much better for computers tho because of repeatability. So the entire time liebenez’s way was the best way Newton got credit but I think people will start to learn Newton’s version now that we do everything with computers.
Without calculus and lots of other maths we wouldn't have a fraction of our modern technology/conveniences. Anybody that thinks math is a bad thing needs to grow up.