The Leibniz catenary and approximation of e — an analysis of his unpublished calculations☆
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Michael Raugh received his Masters and PhD degrees in Mathematics from Stanford University (1979). Now retired, he has worked as mathematician at research laboratories at Stanford University, US Geological Survey and Hewlett-Packard, and served as chief scientist and acting director of the Research Institute for Advanced Computer Science. At HP Labs he patented the first rigorous method for calibrating interferometer stages used in manufacturing computer chips. At UCLA's Institute for Pure and Applied Mathematics he was the founding director of the RIPS program from 2001–2015.
Siegmund Probst studied Mathematics, Economy, German Literature and History of Science at the University of Regensburg (MA 1990, Dr. phil. 1994). From 1994–1995 he worked in a project directed by Christoph J. Scriba, “Edition of the scientific correspondence of John Wallis (1616–1703)” at the University of Hamburg. Since 1995 he is one of the editors of the Mathematical Writings of Leibniz at the Leibniz-Archiv/Leibniz-Forschungsstelle (Gottfried Wilhelm Leibniz Bibliothek Hannover).
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The authors thank Adrian Rice, Eberhard Knobloch, Niccolò Guicciardini, David Pengelley, and Tilman Sauer for discussions and useful suggestions on an earlier draft of this paper, as well as two anonymous reviewers for corrections and observations.