little-book-of/calculus
Therefore, I have attacked [the problem of the catenary] which I had hitherto not attempted, and with my key [the differential calculus] happily opened its secret. - Gottfried Leibniz
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Therefore, I have attacked [the problem of the catenary] which I had hitherto not attempted, and with my key [the differential calculus] happily opened its secret. - Gottfried Leibniz