User:Gavin R Putland

Sometime engineer, tutor, associate lecturer, postdoctoral research assistant, and research officer for economic NGO. No current university affiliation.

I am the main author (but usually not the most recent editor) of the articles a major contributor to and a lesser contributor to
 * Augustin-Jean Fresnel
 * Fermat's principle
 * Fresnel rhomb
 * Index ellipsoid
 * Plane of polarization
 * Total internal reflection,
 * Fresnel equations,
 * A Dynamical Theory of the Electromagnetic Field
 * Fresnel lens.

My debut on Wikisource:
 * A. Fresnel (tr./ed. G.R. Putland), Letter to Arago on biaxial birefringence (21 September 1821), Wikisource, April 2021.

My contributions to Wikimedia Commons:

My derivatives/modifications of Wikimedia Commons files:

Works in progress:
 * Preprint: "Cut the coordinates! (or Vector Analysis Done Fast)";
 * Book: Wave Foundations of Ray Optics;
 * Book: Fresnel, On Light, bicentenary English edition;
 * List of English translations of works by Augustin Fresnel (so far, I am responsible for eight of them).

Other external links:
 * G.R. Putland, "No integration-by-parts, no l'Hôpital, some telescoping", in "Simplest proof of Taylor's theorem", Math Stack Exchange, February 2024;
 * G.R. Putland, "Flawed proofs of the unambiguity of the determinant as defined by cofactor expansions", WikiJournal Preprints, 27 January 2024&mdash;
 * G.R. Putland, "Trigonometric proof of vector triple product expansion", Math Stack Exchange, January 2024;
 * G.R. Putland, "Stirling's approximation: Can we make it obvious?", Math Stack Exchange, ed. October 2023;
 * G.R. Putland, "The unreasonable effectiveness of the cathetus rule in ancient and modern optics", WikiJournal Preprints, 6 May 2023&mdash;
 * G.R. Putland, "Consistent derivation of Kirchhoff's integral theorem and diffraction formula and the Maggi-Rubinowicz transformation using high-school math", /, 19 December 2022;
 * G.R. Putland, "Full conjugations of nearly all French verbs in one page", /, 5 April 2021&mdash;
 * H.A. Lorentz (tr. G.R. Putland), "Centenary of Augustin Fresnel" (1927), /, 8 July 2020&mdash;
 * G.R. Putland (ed.), "H.A. Lorentz on the equivalence of Huygens' construction and Fermat's principle", /, 20 May 2020;
 * G.R. Putland, "A tautological theory of diffraction", /, 5 December 2019;
 * G.R. Putland, "The observation by Huygens that should have discredited Newton's 'rule' for the extraordinary refraction of calcite", 8 October 2016 – 24 May 2018 ;
 * G.R. Putland, "Errata in various editions of Huygens' Treatise on Light", 7 June 2016&mdash;

Find me on Linkedn.