Manuscript and typescript of paper so titled.

Bundles of related notes and calculations: 'Chebychev Polynomials'. 'F.P.C.1. Notes for Subroutines'. Untitled (some pages dated 1955) and loose sheets.

Three bundles of notes and calculations, and loose sheets.

Three bundles of narrative, notes and calculations on 'Exponential Routines'.

Work on 'Wide-range logarithm' sub-routine for Pegasus, notes, calculations, printouts.

Correspondence and offprint on 'infinite series' and 'numbers with a negative base'.

'"Chebycheff" Fraction. Approximations'. Miscellaneous calculations.

Three bundles of notes and calculations, some pages dated.

Five bundles of notes and calculations.

Miscellaneous notes and calculations. Typescript copy of 'loading rules'.

This work, carried out in collaboration with R. Penrose, produced a program for testing on Pegasus, and led to further work by Strachey on matrices and collaborative work with J.G.F. Francis. Six-page manuscript and typescript, with manuscript corrections, of paper on 'Flutter'.

Calculations, routines and printouts.

'Some matrix problems arising from the consideration of flutter in aircraft'. Four-page manuscript and typed versions of paper dated 1 November 1956 with authorisation to publish, dated November 1957.

Five bundles of notes and calculations on flutter, almost all in Strachey's hand but some with additions by R. Penrose. Includes note on 'The information required from flutter calculations' (not in Strachey's hand) and a letter on eigenvalue from R. Penrose, March 1958.

Correspondence on 'Flutter'. Includes: Letter to D.B. Gillies on Pegasus and on 'Flutter' (Strachey's carbon only), February 1957. Correspondence with Armstrong Whitworth Aircraft Ltd. regarding visit by Strachey to demonstrate his 'Flutter' program on the Company's Pegasus machine, December 1957. Correspondence with aircraft companies. Miscellaneous…

'Hilbert Matrix': calculations, routines and printouts on Hilbert coefficients, eigenvalues and eigenvectors (printouts dated April-May 1957).

'Hilbert Matrix Programme': routines and printouts on Hilbert coefficients, idempotents, eigenvalues and matrix inversion.

'Bordered Inversion': calculations, routines and printouts on 'Bordered Hilbert test' and 'Bordered Inversion' (printouts dated October-November 1957); includes bundles of notes on 'Entry', 'Error Analysis' and a note headed 'A new method of inverting matrices'.

Loose pages of notes and a letter on matrices from J.H. Wilkinson

'Transformer Matrix Switching': 4-page manuscript and miscellaneous typescript pages of a paper dated 2 November 1959, with miscellaneous bundles, loose pages and photocopies of notes and calculations.