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

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 :

 Expandable 

My derivatives/modifications of Wikimedia Commons files:

 Expandable 

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 —
  • 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 —
  • G. R. Putland, "Consistent derivation of Kirchhoff's integral theorem and diffraction formula and the Maggi-Rubinowicz transformation using high-school math", Zenodo7205781 / doi:10.5281/zenodo.7205781, 19 December 2022;
  • G. R. Putland, "Full conjugations of nearly all French verbs in one page", Zenodo4662833 / doi:10.5281/zenodo.4662833, 5 April 2021 —
  • H. A. Lorentz (tr. G. R. Putland), "Centenary of Augustin Fresnel" (1927), Zenodo3935795 / doi:10.5281/zenodo.3935795, 8 July 2020 —
  • G. R. Putland (ed.), "H. A. Lorentz on the equivalence of Huygens' construction and Fermat's principle", Zenodo3835134 / doi:10.5281/zenodo.3835134, 20 May 2020;
  • G. R. Putland, "A tautological theory of diffraction", Zenodo3563468 / doi:10.5281/zenodo.3563468, 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 (Archived 26 June 2017 at the Wayback Machine);
  • G. R. Putland, "Errata in various editions of Huygens' Treatise on Light", 7 June 2016 —

Find me on LinkedIn.

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