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I discuss the history of the introduction of the natural logarithm and exponential functions, answering the question of how the logarithm was first discovered and how it's properties were derived, and also why it appeared when it did. I consider several other areas of inquiry that could have led to a theory of exponentials and logarithms, including: compound interest, population/economic/technological growth, physics, gambling, navigation, and pure mathematics. Then I explain the work of John Napier in constructing calculation tables for astronomers that introduced the natural log in 1614. 0:00 Intro 1:05 History of compound interest 6:55 Why exponential growth was not a recognized feature of life in the past 8:10 Exponential functions in physics 10:58 Exp and log in gambling 14:34 Navigation, meridional parts, and the integral of the secant 18:43 Calculation tables and Napier's introduction of ln(x) This is episode 6 in a series called Tricky Parts of Calculus, a series about the subtle and difficult parts of calculus that are usually glossed-over in a calculus class. Tricky Parts of Calculus playlist: • Tricky Parts of Calculus Also check out my channel for general advice and opinions about math, as well as the Daniel Rubin Show podcast for interesting conversations about math and other topics: / @danielrubin1 For a discussion of how e^x shows up in analysis of the Martingale betting strategy, see this great video from Numberphile: • Gambling with the Martingale Strategy - Nu... References: Hald, A History of Probability and Statistics and Their Applications before 1750 https://amzn.to/2ThUmip Havil, John Napier: Life, Logarithms, and Legacy https://amzn.to/2UpMjR7 Newton, Principia https://amzn.to/3ikO5Ln Toeplitz, The Calculus: A Genetic Approach https://amzn.to/3kvNwRE Williams, From Sails to Satellites: The Origin and Development of Navigational Science https://amzn.to/3hLHY3w (I get a small commission from purchases made from these links.) http://sumerianshakespeare.com/70701/...