Sec 5.2, 10/6/09

- I could not understand how the theorem 5.7 is reworded and written as in theorem 5.8. In theorem 5.7 it also talks about subrings being isomorphic but it does not say anything like that in theorem 5.8
-the most interesting part is constructing the tables of the rings Z2[x]/(any polynomial).It is similar to what we did for integers.