Miscellaneous manuscript drafts for paper with this title, perhaps early form of that later published with J.G.F. Francis, Computer Journal, 4.

Includes drafts for 'Preliminaries', 'Special Codiagonal Forms', 'Derivation Form', 'Matrix interpretation of analogue of Bairstow process for Codiagonal form', 'Real roots of an unsymmetric matrix', and a heavily corrected typed version.

Folder includes 8-page manuscript note in another hand 'On the automatic choice of 'best' values for the parameters in Tchebycheff iteration', discussing an automatic program written for EDSAC.