Item 55b - Letters from W. W. Rouse Ball to G. H. Hardy, with notes on the Four Digits and Four Fours Problems

2 letters typescript with MS annotations; 1 and 2 ff);
In wrapper: 4 typed ff; 1 sheet with MS notes on back plus 1 MS sheet; 21 sheets of MS notes and calculations.

Gift of Professor Abram Besicovitch, August 1962?

Letter, 11 Sept 1918 from Rowse Ball to Hardy sent with 'a copy of what I said about the Four Digits and the Four "4s" Problems in my Recreations'; another letter, 12 Sept 1918, from Rowse Ball to Hardy on the Four Digits Problem. Paper wrapper labelled 'De 1, 2, 3, 4 problem' containing 2 folded typed sheets, with MS annotations, headed 'From my Math. Rec. [Mathematical Recreations and Essays, published by Rowse Ball in 1892]' 'Four Digits Problem' and 'Four Fours Problem'; printed sheet, 'An Extension of the Sturm-Liouville Expansion', with MS notes on back, plus another sheet ; 21 sheets of MS notes and calculations.

Labelled as 'with Add.MS/b/55 + 56' - unclear whether this was included with them in the donation from Professor Abram Besicovitch in August 1962.