Type "./math" from the shell prompt to run Mathomatic using m4 as a macro
pre-processor for allowing easy entry of functions.  The executable file
"math" is a shell script and is only known to work with GNU software.
Available Functions are listed in the file "functions.m4".  Using this,
trigonometry functions (sin(x), cos(x), etc.) are implemented as complex
exponentials in Mathomatic.

Readline and shelling out don't work while using m4, and the "quit" and
"exit" commands have some delay.  Use control-D to quit, instead.  Also, the
read command currently doesn't use m4, so it can't process functions.  The
only way to read in files with functions is to type "./math <filename" from
the shell prompt.
