The rest of 3.1, due Friday, January 20

The section for today was the second half of 3.1, Definition and Examples of Rings.

I didn't think that this was particularly difficult, but if I had to choose something, I'd say theorem 3.1. I'd like to see the proof of that.

I thought that it was an interesting section. I liked learning about subrings. I liked the last example; it was so simple and logical.