"Thanks much for your scholarship!
(I had the spelling `Chaw' from his
friend T.C. Hu, who phoned him in August 2005 to verify that he had
indeed written the paper about threshold functions. T.C. is not
meticulous about spelling, and of course many different systems are
possible; T.C. was probably only concerned to get the character
right (Unicode 7D39). So I consider the thesis reference (and
patent reference) definitive, and IOU $2.56.
Please write again if you find anything else amiss. I am pleased that
you found my pre-book!
-- don knuth"