spell
4.4BSD snapshot (revision 8.1); add 1993 to copyright
fix string describing `NaN'
remove author section
macro and text revision (-mdoc version 3)
add comma
intro(3M) => math(3M), move see also's to end
new from Kahan
Revision by Prof. Kahan
Add a Notes section.
Add E and L to descriptor line
.if for screen verses typesetter
From Prof. Kahan
4.3BSD beta release manual page
manual page distributed with 4.2BSD
manual page distributed with 4.1BSD