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Jeffreys, Bertha (1903-1999), Lady Jeffreys, mathematician
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Letter from Augustus De Morgan to Robert Leslie Ellis
Letter from Augustus De Morgan to Robert Leslie Ellis
Add. MS c/67/111 · Item · 24 June 1854
Parte de Additional Manuscripts c

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.
Misc. later items of biographical interest
TAYL/A/51 · Documento
Parte de Papers of Sir Geoffrey Taylor (G. I. Taylor)

Includes correspondence re portrait of Taylor by Ruskin Spear, to commemorate his 80th birthday, 1965-66, a telegram of greeting from conference at Kyoto, 1966, group letter of greeting for birthday, 1973. Also a draft letter from Taylor to Bertha Jeffreys, which begins: `Thank you so much for coming in and relieving my boredom for an hour today', and continuing with a scientific speculation on hydraulic resistance. The letter tails off, and was never sent. It is undated, but may be one of the last he wrote and is characteristic of Taylor's unquenchable scientific curiosity and his fight against increasing physical disability.
Letters of congratulation on the award of the Order of Merit: correspondents J-M
TAYL/A/74 · Documento · 1969
Parte de Papers of Sir Geoffrey Taylor (G. I. Taylor)

Letters from Bertha Jeffreys, Harold Jeffreys, Geoffrey Keynes, T. Knox-Shaw, Dietrich Küchemann, N. Kurti, David Lane, Jill Levetus, Casimir Lewy, James Lighthill, Ben Lockspeiser, Andrew McFadyean, George McKerrow, David Martin, Eleanor Megaw, Dora Middleton, Keith Moffatt, and Morien Morgan.
Philip E. B. Jourdain: memoir by Millicent Jourdain, offprints of his articles, and an offprint of his obituary in Isis
Add. MS c/86 · Documento · 20th cent
Parte de Additional Manuscripts c

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.

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