The amount of stuff in ExpMath will increase as the course goes on.

When a filename has a date as part of the name, it means:
    31aug.pdf    A file used during class.
    31aug09.sws  The SAGE workspace actually created live.
    assignment31aug.pdf   Homework to be attempted afterwards.

In general, any filename ending in .sws can be uploaded into SAGE.

Some material suitable for self-study at a slower pace than the
official SAGE tutorial will also appear there.