Today I looked at the ¡­

Today I looked at the symmetries of a square. Defined a group, showed some of the basic, elementary properties, defined isomorphisms and homomorphisms. Gave a lot of examples of groups. This corresponds to section 4 in the book.

On next wednesday I'll do section 5, subgroups, and may be start on cyclic groups, section 6.

On friday we do the exercises.

G