Talk:Anders Johan Lexell

Is December 24, 1740 birthdate under the Julian or Gregorian calendar?
Lexell was born in 1740, but Sweden (which Finland was part of at the time) didn't adopt the Gregorian calendar until 1753. Is the listed birthdate in this article of December 24th, 1740 under the Gregorian (New Style) calendar? If so, shouldn't a Julian (Old Style) calendar date be added? — Preceding unsigned comment added by Bunkyray5 (talk • contribs) 01:31, 28 December 2020 (UTC) Forgot to sign my post Bunkyray5 (talk) 01:35, 28 December 2020 (UTC)

work in spherical geometry/trigonometry
Lexell did important work in spherical geometry which it would be great to describe here. Some references:


 * Papadopoulos, Athanase. "On the works of Euler and his followers on spherical geometry." arXiv preprint arXiv:1409.4736 (2014).
 * Atzema, Eisso J. " 'A Most Elegant Property': On the Early History of Lexell’s Theorem." In Research in History and Philosophy of Mathematics: The CSHPM 2016 Annual Meeting in Calgary, Alberta, pp. 117-132. Springer International Publishing, 2017.
 * Zhukova, A. "On the Contribution of Anders Johan Lexell in Spherical Geometry." Ganita Bharati 41, no. 1/2 (2019): 127-149.
 * Maehara, Hiroshi, and Horst Martini. "On Lexell's Theorem." The American Mathematical Monthly 124, no. 4 (2017): 337-344.
 * Simonič, Aleksander. "Lexell’s theorem via stereographic projection." Beiträge zur Algebra und Geometrie/Contributions to Algebra and Geometry 60 (2019): 459-463.

I’ll try to get around to creating a page about Lexell's locus or Lexell's theorem (with one title redirecting to the other) at some point. But the folks here, who seem to have done a good job with other parts of Lexell's work, might be interested to add some material to this article as well. –jacobolus (t) 05:02, 17 February 2023 (UTC)


 * Update: Lexell's theorem was created. This article could still describe more of Lexell's relevant work in spherical geometry/trigonometry though. –jacobolus (t) 00:55, 14 January 2024 (UTC)