Air Showers of Size Greater than 105 Particles: (I) Core Location and Shower Size Determination

Foreword re C. S. Wallace

“…generators [263,269,272,274,279]. However, it is a shortcoming in the current author that this immediate past sentence fails to mention Chris's work on data processing in the early cosmic ray experiments in Sydney [45,40], one of his papers that can cause some mirth [167], his analysis of nasal support [59], his direct contributions to computer science course structure, syllabi and education 27 , and vastly many other works. I have tried to cite them below -from 28 29 his first works [182,181] helping a fellow (1954) Honours student (Brian O'Brien 30 ) to get his project to work, to his last work published while he was alive [217] to his posthumously published book on MML [287] and the only other two works of his to date that have appeared posthumously [151,293] -and 31 I have also endeavoured to list them at www.csse.monash.edu.au/~dld/CSWallacePublications.…”

“…I recall hearing that Brendan Macmillan approached Chris once in the early 1990s and asked Chris whether he knew any good random number generation software. Chris 45 went off and produced [274,279] 46 47 .…”

“…0.2.2 and in footnotes 82 and 185) wrote shortly after Chris's death: "I feel very privileged to have had the opportunity to assist Chris in his work -he had an amazing brain and memory for facts and figures (one member of staff said to me once "I will ask Chris -he knows everything.")." 45 already the author of [263,269,272] 46 for a discussion of this work, see Richard P. Brent's paper in this issue [47] 47 Dr Peter E. Tischer tells me that he once asked Chris about applying MML to images (and compression thereof) and that Chris seemed to respond to such comments as (invitations or) challenges. Peter says that his comment is what led to [283].…”

“…Chris was already a Bayesian from his mid-20s in the 1950s [40, sec. 4] [45,Appendix] while David Boulton was clearly talking here in the spirit of (en)coding. Story has it that they had their separate approaches, went away and did their mathematics separately, re-convened about 6 weeks later and found out that they were doing essentially the same thing 213 .…”

“…Max Brennan [40] worked with Chris (and others, including Mike Rathgeber) on data processing in the early cosmic ray experiments in Sydney [41,43,45,42,44,292] 221 , and was likewise involved with SILLIAC [73, p64, p70] 222 . Max talks of the statistical distributions, Chris's (early [Bayesian]) data analysis and the contemporary set-up and equipment.…”