[ Mathematics; Fermat's ] Four substantial Autograph Letters Signed and one APC Signed "J.M. Child" to "Sir Richard [Harington]", on mathematical themes including Fermat's.

J.M. Child, Mathematician [James Mark Child; History of Mathematics ]
Publication details: 
Camford, Llandulais, North Wales.,10 February to 15 November 1947.

Five letters and a postcard, two letters 8vo (total 4pp.), three 4to (total 17 pages), fold marks, good condition. LETTER ONE (6pp., 4to,, 10 Feb.) He starts, "You've done it!!! | I told you that one of your ideas would bear fruit one of these days, and it was a mistaken statement, at least one I think is mistaken, that set me off on a new track which led to success.

[ William Marrat, mathematician and topographer. ] Autograph Letter Signed ('Wm. Marrat'), asking Professor Robert Wodehouse of Cambridge to give his opinion of his 'demonstration of the Binomial Theorem', which is included in the letter.

William Marrat (1772-1852), mathematician and topographer [ Robert Woodhouse (1773-1827), Plumian Professor of Astronomy at the University of Cambridge ]
Publication details: 
54 Copperas Hill, Liverpool. 20 July 1822.

3pp., 4to. Bifolium. In good condition, on lightly aged-paper, with small piece torn from second leaf. Addressed, with postmark, on reverse of second leaf, to 'Robt. Woodhouse Esqr. A.M. | Plumian Professor of Astronomy & Experimental Philosophy, | Cambridge'. He writes: 'I have just made out the following demonstration of the Binomial Theorem, & as it is very short, & quite elementary, I shall be extremely obliged if you will condescent [sic] to honour me with your opinion of it before I make it public.' A full two pages of calculations, in a smallish hand, follow.

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