First, we can not yet handle functions of two variables such as
Perm(5,4). This is something we want to be able to handle, but it will
require more extensive changes to AlgParser.pm than we want to attempt
quickly. We may want to ask the original author of AlgParser.pm, Dan
Martin, for help with this. For example, at this point, a coma "," is
an illegal character in a student's answer.
If you want students to be able to use thje function "fact", all you
need to do is to edit AlgParser.pm in two places. The easiest thing to
do is to search for "logten" in AlgParser.pm, and add "fact" to the
list of functions you will find in those two places.
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