Previously, calls to m4_math typically had @math{foo} for the info
arg. Now, let m4_math automatically add @math for the info arg. This
will allow use to define m4_mathdot to place a dot after the arg so it
doesn't have to be done manually. This is analogous to mref, mrefdot,
and mrefcomma.
Add description of the behavior of Ai(x) and Bi(x)
As mentioned by Michel Talon, we should say a little more about the
behavior of Ai(x) and Bi(x) which makes them the desired solutions of
the differential equation. Both are oscillatory for x < 0. Ai(x)
approaches 0 as x -> inf. Bi(x) is unbounded as x->inf.
Previously, fnindex entries in the HTML file looked like
"Logical-conjunction-1". We replaced the dashes with spaces to get an
key of "Logical conjunction 1". However, "?? logical con" lists
"Logical conjuction <1>", and we converted " <1>" to "-1" before
passing it on. This works for other entries but not fnindex.
To make it work, we need to put back the dash so that the key is
"Logical conjuction-1".
