From: utzoo!utcsrgv!utcsstat!geoff Newsgroups: net.unix-wizards Title: UNIX Mathematical Functions History Article-I.D.: utcsstat.127 Posted: Mon May 10 16:27:41 1982 Received: Mon May 10 18:42:14 1982 I can't seem to get mail to csk@ucla-security so I am replying to the whole group. Sorry. v6 math library routines usually contain a comment like this from atan.s: coefficients are #5076 from Hart & Cheney; v7 comments are usually like this from atan.c: coefficients are #5077 from Hart & Cheney (19.56D). `Hart & Cheney' refers to Computer Approximations by Hart, Cheney, Lawson, Maehly, Mesztenyi, Rice, Thacer, Witzgall, published by Robert E. Krieger Publishing, QA297.C64 1978, ISBN 0-88275-642-7. The coefficient # (such as 5076) refers to a table in a later chapter; 19.56 refers to precision; I don't know what D stands for. As well, William Waite at BTL may have had some influence, particularly a book he co-wrote with William J. Cody, Jr. called Software Manual for the Elementary Functions published by Prentice-Hall, QA331.C635 1980, ISBN 0-13-822064-6. Geoff Collyer, U. of Toronto Computing Services