Dr. Hunt's model checker has been posted in the class tools directory.
You can find instructions on how to access it at the bottom of
http://www.cs.utexas.edu/users/ragerdl/cs378/tools.html . You'll
probably want to play around with it sometime before the test, as it's
likely a test question that uses at least a subset of its notation
will appear on the midterm. Please let me know if there are usability
issues (such as permissions problems).
If you're unclear about how a particular operator works (for example,
maybe EF), this discussion group is a great forum for figuring it out.
David