Henri Poincaré Papers (correspondence calendar), 2026-10-06 (Investigator, Step I, run 1)

Site: https://henripoincarepapers.univ-nantes.fr/chp/ (Nantes mirror of the Archives Henri-Poincaré edition; poincare.univ-lorraine.fr is the Lorraine portal). Reached in Chrome. The full alphabetical calendar (0alphapub.html, 726 KB) was too large for the browser text tool, so the same public page was fetched as text and searched. Queries: Google site:henripoincarepapers.univ-lorraine.fr Halsted (no results); Google Henri Poincaré papers correspondence Halsted letters univ-lorraine. In the calendar, searched for: Halsted, Kaufmann, Bucherer, Wolfskehl, Monist, Carus, Hilbert, Abraham, Langevin, Lorentz, Lille, Wacker.

Found (priority 4, historical record; priority 1, own letters)

URL: https://henripoincarepapers.univ-nantes.fr/chp/0alphapub.html - Arranging the Göttingen lectures (Hilbert letters) [web, calendar entries 181.2-181.8]: - 181.2 Hilbert to HP, 1908-11-06: "Ihre Zusage hat uns alle hoch erfreut ..." - 181.3 HP to Hilbert, 1908-11-07: "Je suis très flatté de votre proposition et je suis très disposé à l'accepter" - 181.4 Hilbert to HP, 1908-11-19: "Wir rechnen nun darauf, dass Sie Ihre Vorträge in die Woche vom 22--28sten April nächsten Jahres verlegen" - 181.5 HP to Hilbert, 1909-02: "Voici les titres des sujets que je me propose de traiter" (the list of lecture titles; it should show when "La mécanique nouvelle" was added) - 181.6-181.8, Feb-Mar 1909: programme letters ("Mon programme sur les applications de l'équation de Fredholm ...") - Lorentz correspondence [web, entries 232.1-232.7]: 1901-01-20; HP to Lorentz 1905-04-27 and three letters of May 1905, one reading "J'ai continué les recherches dont je vous avais parlé. Mes résultats confirment pleinement les vôtres en ce sens"; Lorentz to HP 1906-03-08; HP to Lorentz 1910. These are Poincaré's own letters from the months when he wrote the Dynamics of the Electron. - 1.1 Abraham, Henri (not Max Abraham), HP 1909-04-11: no bearing found from the calendar line. - Not in the calendar: Halsted, Kaufmann, Bucherer, Wolfskehl (by name), Monist or Carus, Wacker. Langevin has only a 1903 dinner invitation.

Bearing

The letters date the Göttingen invitation (Nov 1908) and the lecture week (22-28 April 1909), independently of the Wikisource header. The May 1905 Lorentz letters are Poincaré's own statements of his relativity results, and the scans are online ("Scan" column). Not opened this run: the letter texts and scans, especially 181.5 (lecture titles) and the 1905 Lorentz letters.