Offers a theorem for the four colour problem, which has become an axiom in his mind, an example of Whewell's latent axiom, things which are not at first credible but which settle down into first principles, asks for Ellis' thoughts.
1947–49, 1966
A collection of papers by or relating to Jourdain: typescript carbon of an unsigned memoir, 'Philip', written by Jourdain's sister Millicent [or Melicent], with 35 printed journals and offprints by Jourdain dated 1903 to 1917, described below. With an offprint of the biography of Jourdain by Laura Jourdain and George Sarton from Isis no. 13, vol. V, I, Oct. 1922. Accompanied by three copies of a printed portrait of Jourdain.
The offprints are from Archiv der mathematik und physik, Bibliotheca Mathematica, Mathematische Annalen, The messenger of mathematics, Mind, Philosophical magazine, The proceedings of the London Mathematical Society, The quarterly journal of pure and applied mathematics, Revue de mathématiques, Science Progress, Scientia and papers printed for the International Congress of Mathematicians, Cambridge, three issues of the monthly magazine The Open Court featuring articles by Jourdain. An article, 'The theory of irrational numbers, part I' is also present, from an unidentified journal.
Jourdain, Philip Edward Bertrand (1879-1919) historian of mathematics