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The progress of Science consists in observing interconnections and in showing with a patient ingenuity that the events of this ever-shifting world are but examples of a few general relations, called laws. To see what is general in what is particular, and what is permanent in what is transitory, is the aim of scientific thought.
An Introduction to Mathematics.
Leonhard Euler's Integral Calculus
The title page of Leonard Euler’s Integral Calculus, vol. 1 (1768). The complete work in three volumes appeared in the interval 1768 – 1770. This was the first complete textbook published on the integral calculus. The entire Integral Calculus is available at the Euler Archive.
Euler’s discussion on page 121 of volume 1 of his Integral Calculus concerning the integration of logarithmic and exponential functions. Note that Euler used lx to represent what we write as ln(x).
An excerpt, pp. 182–183, from volume 2 of Euler’s Integral Calculus, demonstrating a series solution for a differential equation.