Read: Section 5.4 and start of 5.5.
Turn in: 5.71, 5.77, 5.78
- Lots of reading this time—sorry! Please bring any questions to class.
- On 5.77, to check if the set is an ideal, you’re working with Definition 5.75: you need to check if the set is a subring and if it is “closed under left- and right-multiplication by the full ring.”
- When you get to 5.78(6), Facts 5.74(1) and 5.76 are the main results for working with a quotient.
Extra practice: 5.72, 5.73